plugin: fix bug that watch loop will refresh frequently when channel closed (#49275)

[ti-chi-bot]

This is an automated cherry-pick of #49275

What problem does this PR solve?

Issue Number: close #49273

What changed and how does it work?

Recreate watch channel when it is closed

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.

fix bug that watch loop will refresh frequently when channel closed sometimes

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CbcWestwolf, lcwangchao

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• OWNERS [CbcWestwolf,lcwangchao]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-12-08 09:13:41.566889838 +0000 UTC m=+1912.604116749: ☑️ agreed by lcwangchao.
• 2023-12-08 09:17:09.884765987 +0000 UTC m=+2120.921992915: ☑️ agreed by CbcWestwolf.