br: refactor error handle mechanism to tolerant unexpect kv errors. (#48646)

[ti-chi-bot]

This is an automated cherry-pick of #48646

What problem does this PR solve?

Issue Number: close #47656

Problem Summary:
record the state of unknown kv error and give some tolerance of these unknown error.

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.5@44f39e9). Click here to learn what that means.
The diff coverage is 81.2030%.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-6.5     #49274   +/-   ##
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  Hits                   ?     259357           
  Misses                 ?      75606           
  Partials               ?      16571           

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BornChanger, Leavrth

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• OWNERS [Leavrth]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-02-21 02:24:49.577076397 +0000 UTC m=+410378.324699511: ☑️ agreed by Leavrth.
• 2024-02-21 02:47:53.508875235 +0000 UTC m=+411762.256498347: ☑️ agreed by BornChanger.

[BornChanger]

/retest