Querying A LOT of issues results in exceeding maximum embed size

[Jackenmen]

When you query a lot of issues, the cog might exceed the maximum embed size.

Example reproduction message (red is configured to Cog-Creators/Red-DiscordBot repository):

red#1 red#2 red#3 red#4 red#5 red#6 red#7 red#8 red#9 red#10 red#11 red#12 red#13 red#14 red#15 red#16 red#17 red#18 red#19 red#20 red#21 red#22 red#23 red#24 red#25 red#26 red#27 red#28 red#29 red#30 red#31 red#32 red#33 red#34 red#35 red#36 red#37 red#38 red#39 red#40 red#41 red#42 red#43 red#44 red#45 red#46 red#47 red#48 red#49 red#50 red#51 red#52 red#53 red#54 red#55 red#56 red#57 red#58 red#59 red#60 red#61 red#62 red#63 red#64 red#65 red#66 red#67 red#68 red#69 red#70 red#71 red#72 red#73 red#74 red#75 red#76 red#77 red#78 red#79 red#80 red#81 red#82 red#83 red#84 red#85 red#86 red#87 red#88 red#89 red#90 red#91 red#92 red#93 red#94 red#95 red#96 red#97 red#98 red#99 red#100 red#101 red#102 red#103 red#104 red#105 red#106 red#107 red#108 red#109 red#110 red#111 red#112 red#113 red#114 red#115 red#116 red#117 red#118 red#119 red#120 red#121 red#122 red#123 red#124 red#125 red#126 red#127 red#128 red#129 red#130 red#131 red#132 red#133 red#134 red#135 red#136 red#137 red#138 red#139 red#140 red#141 red#142 red#143 red#144 red#145 red#146 red#147 red#148 red#149 red#150 red#151 red#152 red#153 red#154 red#155 red#156 red#157 red#158 red#159 red#160 red#161 red#162 red#163 red#164 red#165 red#166 red#167 red#168 red#169 red#170 red#171 red#172 red#173 red#174 red#175 red#176 red#177 red#178 red#179 red#180 red#181 red#182 red#183 red#184 red#185 red#186 red#187 red#188 red#189 red#190 red#191 red#192 red#193 red#194 red#195 red#196 red#197 red#198 red#199 red#200 red#201 red#202 red#203 red#204 red#205 red#206 red#207 red#208 red#209 red#210 red#211 red#212 red#213 red#214 red#215 red#216 red#217 red#218 red#219 red#220 red#221 red#222 red#223 red#224 red#225 red#226 red#227 red#228 red#229 red#230 red#231 red#232 red#233 red#234 red#235 red#236 red#237 red#238 red#239 red#240 red#241 red#242 red#243 red#244 red#245 red#246 red#247 red#248 red#249 red#250 red#251 red#252 red#253 red#254 red#255 red#256 red#257 red#258 red#259 red#260 red#261 red#262 red#263

Traceback:

Ignoring exception in on_message_without_command
Traceback (most recent call last):
  File "C:\Users\Jakub\OneDrive\Dokumenty\Red-DiscordBot\.venv\lib\site-packages\discord\client.py", line 343, in _run_event
    await coro(*args, **kwargs)
  File "C:\Users\Jakub\OneDrive\Dokumenty\Sentinel\githubcards\core.py", line 270, in on_message_without_command
    await self._query_and_post(message, fetchable_repos)
  File "C:\Users\Jakub\OneDrive\Dokumenty\Sentinel\githubcards\core.py", line 309, in _query_and_post
    await message.channel.send(embed=embed)
  File "C:\Users\Jakub\OneDrive\Dokumenty\Red-DiscordBot\.venv\lib\site-packages\discord\abc.py", line 1065, in send
    data = await state.http.send_message(channel.id, content, tts=tts, embed=embed,
  File "C:\Users\Jakub\OneDrive\Dokumenty\Red-DiscordBot\.venv\lib\site-packages\discord\http.py", line 254, in request
    raise HTTPException(r, data)
discord.errors.HTTPException: 400 Bad Request (error code: 50035): Invalid Form Body
In embed: Embed size exceeds maximum size of 6000

I also tried the same with 4k char limit:

red#1 red#2 red#3 red#4 red#5 red#6 red#7 red#8 red#9 red#10 red#11 red#12 red#13 red#14 red#15 red#16 red#17 red#18 red#19 red#20 red#21 red#22 red#23 red#24 red#25 red#26 red#27 red#28 red#29 red#30 red#31 red#32 red#33 red#34 red#35 red#36 red#37 red#38 red#39 red#40 red#41 red#42 red#43 red#44 red#45 red#46 red#47 red#48 red#49 red#50 red#51 red#52 red#53 red#54 red#55 red#56 red#57 red#58 red#59 red#60 red#61 red#62 red#63 red#64 red#65 red#66 red#67 red#68 red#69 red#70 red#71 red#72 red#73 red#74 red#75 red#76 red#77 red#78 red#79 red#80 red#81 red#82 red#83 red#84 red#85 red#86 red#87 red#88 red#89 red#90 red#91 red#92 red#93 red#94 red#95 red#96 red#97 red#98 red#99 red#100 red#101 red#102 red#103 red#104 red#105 red#106 red#107 red#108 red#109 red#110 red#111 red#112 red#113 red#114 red#115 red#116 red#117 red#118 red#119 red#120 red#121 red#122 red#123 red#124 red#125 red#126 red#127 red#128 red#129 red#130 red#131 red#132 red#133 red#134 red#135 red#136 red#137 red#138 red#139 red#140 red#141 red#142 red#143 red#144 red#145 red#146 red#147 red#148 red#149 red#150 red#151 red#152 red#153 red#154 red#155 red#156 red#157 red#158 red#159 red#160 red#161 red#162 red#163 red#164 red#165 red#166 red#167 red#168 red#169 red#170 red#171 red#172 red#173 red#174 red#175 red#176 red#177 red#178 red#179 red#180 red#181 red#182 red#183 red#184 red#185 red#186 red#187 red#188 red#189 red#190 red#191 red#192 red#193 red#194 red#195 red#196 red#197 red#198 red#199 red#200 red#201 red#202 red#203 red#204 red#205 red#206 red#207 red#208 red#209 red#210 red#211 red#212 red#213 red#214 red#215 red#216 red#217 red#218 red#219 red#220 red#221 red#222 red#223 red#224 red#225 red#226 red#227 red#228 red#229 red#230 red#231 red#232 red#233 red#234 red#235 red#236 red#237 red#238 red#239 red#240 red#241 red#242 red#243 red#244 red#245 red#246 red#247 red#248 red#249 red#250 red#251 red#252 red#253 red#254 red#255 red#256 red#257 red#258 red#259 red#260 red#261 red#262 red#263 red#264 red#265 red#266 red#267 red#268 red#269 red#270 red#271 red#272 red#273 red#274 red#275 red#276 red#277 red#278 red#279 red#280 red#281 red#282 red#283 red#284 red#285 red#286 red#287 red#288 red#289 red#290 red#291 red#292 red#293 red#294 red#295 red#296 red#297 red#298 red#299 red#300 red#301 red#302 red#303 red#304 red#305 red#306 red#307 red#308 red#309 red#310 red#311 red#312 red#313 red#314 red#315 red#316 red#317 red#318 red#319 red#320 red#321 red#322 red#323 red#324 red#325 red#326 red#327 red#328 red#329 red#330 red#331 red#332 red#333 red#334 red#335 red#336 red#337 red#338 red#339 red#340 red#341 red#342 red#343 red#344 red#345 red#346 red#347 red#348 red#349 red#350 red#351 red#352 red#353 red#354 red#355 red#356 red#357 red#358 red#359 red#360 red#361 red#362 red#363 red#364 red#365 red#366 red#367 red#368 red#369 red#370 red#371 red#372 red#373 red#374 red#375 red#376 red#377 red#378 red#379 red#380 red#381 red#382 red#383 red#384 red#385 red#386 red#387 red#388 red#389 red#390 red#391 red#392 red#393 red#394 red#395 red#396 red#397 red#398 red#399 red#400 red#401 red#402 red#403 red#404 red#405 red#406 red#407 red#408 red#409 red#410 red#411 red#412 red#413 red#414 red#415 red#416 red#417 red#418 red#419 red#420 red#421 red#422 red#423 red#424 red#425 red#426 red#427 red#428 red#429 red#430 red#431 red#432 red#433 red#434 red#435 red#436 red#437 red#438 red#439 red#440 red#441 red#442 red#443 red#444 red#445 red#446 red#447 red#448 red#449 red#450 red#451 red#452 red#453 red#454 red#455 red#456 red#457 red#458 red#459 red#460 red#461 red#462 red#463 red#464 red#465 red#466 red#467 red#468 red#469 red#470 red#471 red#472 red#473 red#474 red#475 red#476 red#477 red#478 red#479 red#480 red#481 red#482 red#483 red#484 red#485 red#486 red#487 red#488 red#489 red#490 red#491 red#492 red#493 red#494 red#495 red#496 red#497 red#498 red#499 red#500 red#501 red#502 red#503 red#504 red#505 red#506 red#507 red#508 red#509 red#510 red#511 red#512 red#513

Weirdly enough, the cost of requesting 500 issues is the same as the cost of requesting 1 issue so this can't be leveraged to use huge amounts of rate limit. I was also interested to see whether GitHub won't reject the API request for exceeding payload size or something like that but that didn't seem to happen either. Anyway, I still think we should probably just limit the number of issues we request to something like 50 and ignore all remaining message content. 50 is definitely more than I would expect the person to ever request on a normal basis but I think we should keep some wiggle room rather than put a limit that is too small.

With consideration of message components usage that we wanted to introduce, we could probably limit it to 26 (1 card + the max of 25 select options is what I've seen you test) which still gives wiggle room.