crypto: use a new withheld code when history is marked as "not shareable"

[richvdh]

MSC4268 now defines a new withheld code for use when the session is not marked as shared_history: start using it, and add a test to make sure it is sent correctly.

part of element-hq/element-meta#2876

[codspeed-hq]

CodSpeed Performance Report

Merging #5807 will not alter performance

_{Comparing rav/history_sharing/not_shared_code (855075b) with main (9fff07d)}

Summary

✅ 50 untouched

[richvdh]

I've removed the wildcard pattern in a few enums, so that it's harder to miss places when adding new withheld codes.

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.52%. Comparing base (547ab31) to head (ef3c671).
⚠️ Report is 62 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...x-sdk-crypto/src/types/events/room_key_withheld.rs	66.66%	3 Missing and 1 partial ⚠️
crates/matrix-sdk-crypto/src/store/mod.rs	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5807      +/-   ##
==========================================
+ Coverage   88.50%   88.52%   +0.02%     
==========================================
  Files         360      360              
  Lines      100719   100731      +12     
  Branches   100719   100731      +12     
==========================================
+ Hits        89138    89177      +39     
+ Misses       7396     7371      -25     
+ Partials     4185     4183       -2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[poljar]

Looks good.