[Bug] Fix problem for thread safety issues and setting the status of non-existent replica does not prompt any error message

[caiconghui]

Proposed changes

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Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)
• Code refactor (Modify the code structure, format the code, etc...)

Checklist

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• I have created an issue on (Fix [Bug] thread safety issues for replayBackendTabletsInfo and setting the replica status that does not exist does not prompt any error message #6020) and described the bug/feature there in detail
• Compiling and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• If these changes need document changes, I have updated the document
• Any dependent changes have been merged

Further comments

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[morningman]

LGTM