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 08:53:14.445583754 +0000 UTC m=+685.482810678: ☑️ agreed by lcwangchao.
• 2023-12-08 09:18:04.476798258 +0000 UTC m=+2175.514025170: ☑️ agreed by CbcWestwolf.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-7.5@00380bd). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

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Flag	Coverage Δ
unit	71.9784% <0.0000%> (?)

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Components	Coverage Δ
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parser	∅ <0.0000%> (?)
br	53.2512% <0.0000%> (?)