advancer: fix the incorrect gc safepoint behaviours (#52835)

[ti-chi-bot]

This is an automated cherry-pick of #52835

What problem does this PR solve?

Issue Number: ref https://github.com/pingcap/tidb/issues/52082

Problem Summary:

1. Advancer didn't handle GC response correct, if set the safepoint smaller(Normally it won't happen, because the ts from advancer always closed to the current time(RPO <= 5min)) than current service safepoint, it still get the response without error.
2. Set service safepoint to 0 won't delete the value.

What changed and how does it work?

1. handle the response with smaller ts request.
2. add new interface to remove service safepoint.

Check List

Tests

• [x] 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 the issue that del task won't clean up service safepoint.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.

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Additional details and impacted files

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##             release-7.5     #56698   +/-   ##
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Flag	Coverage Δ
unit	73.7516% <0.0000%> (?)

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Components	Coverage Δ
dumpling	52.9400% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	54.8311% <0.0000%> (?)

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 3pointer, YuJuncen

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• ~~br/OWNERS~~ [3pointer,YuJuncen]

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-10-17 08:16:19.966428888 +0000 UTC m=+518177.115338712: :ballot_box_with_check: agreed by YuJuncen.
• 2024-12-24 09:33:14.317709776 +0000 UTC m=+1554184.406512318: :ballot_box_with_check: agreed by 3pointer.

[jebter]

/retest

[jebter]

/retest