More explicit reason when failed to access to the Region of schema

[JaySon-Huang]

Enhancement

When tiflash can not connect to the Region of schema, it panics.
Because there could be some raft-log or snapshot to be applied from proxy to TiFlash, while TiFlash can not fetch the schema from TiKV.
The error message in this situation is too implicit and can not print the stack trace.

[2023/12/12 13:57:04.592 +00:00] [ERROR] [Exception.cpp:91] ["Poco::Exception. Code: 1000, e.code() = 14, e.displayText() = Exception: Region epoch not match after retries: Region {2988366876,36283,3252} not in region cache., e.what() = Exception"] [source="DB::RawCppPtr DB::PreHandleSnapshot(DB::EngineStoreServerWrap *, DB::BaseBuffView, uint64_t, DB::SSTViewVec, uint64_t, uint64_t)"] [thread_id=2688]

[2023/12/12 13:56:13.840 +00:00] [ERROR] [Exception.cpp:91] ["Poco::Exception. Code: 1000, e.code() = 14, e.displayText() = Exception: Region epoch not match after retries: Region {2988366876,36283,3252} not in region cache., e.what() = Exception"] [source="DB::EngineStoreApplyRes DB::HandleWriteRaftCmd(const DB::EngineStoreServerWrap *, DB::WriteCmdsView, DB::RaftCmdHeader)"] [thread_id=2673]


[2023/12/12 13:40:16.865 +00:00] [ERROR] [SchemaSyncService.cpp:101] ["Sync schemas failed by Exception: Region epoch not match after retries: Region {2988366876,36283,3252} not in region cache."] [source="keyspace=3490"] [thread_id=1608]

[JaySon-Huang]

similar issue for failed to connect to PD: #8323