2.4.0rc7: Improvements and bug fixes

What's Changed

• Fix the missing separators in nvflare cli by @IsaacYangSLA in #2246
• Reduce CellPipe heartbeat error log by @yanchengnv in #2245
• Enhance the cloud script on the SSH inbound rule by @IsaacYangSLA in #2249
• Fix p2p encrypt/decrypt by @yanchengnv in #2251
• Fix integration tests by @SYangster in #2254
• Fix POC HE mode, add HE step-by-step example by @SYangster in #2255
• Enhanced the client job status by @yhwen in #2247
• add Clara FL white paper [skip ci] by @chesterxgchen in #2257
• added back the API auto login after server restart by @yhwen in #2256
• Fix CCWF with Client API, ParamsConverter supported_tasks by @SYangster in #2260
• Changed the TASK_UNKNOWN to log debug by @yhwen in #2262
• Fix simulator rc by @yhwen in #2263
• add notes for ``tree``` commands by @chesterxgchen in #2264
• Add global round info for logging metrics global step by @nvkevlu in #2258
• Address few misc. bugs by @chesterxgchen in #2252
• Fix launch_once=false connection error by @SYangster in #2269
• Fixed a case the admin has no auth_tokens for keycloak integration by @yhwen in #2268
• added handle for the empty return code file by @yhwen in #2261

Full Changelog: 2.4.0rc6...2.4.0rc7