statistics: GCStats should not wrongly remove record of an existing table (#58108)

[ti-chi-bot]

This is an automated cherry-pick of #58108

What problem does this PR solve?

Issue Number: close #57983

Problem Summary:

When we try to delete the stats. We need to first ensure that the table is already deleted.

What changed and how does it work?

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.

修复统计信息垃圾回收时可能错误的删除统计信息记录的问题
Fix the issue that the stat' GC process may wrongly delete records of statistics.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-8.5@ea99941). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.5     #58796   +/-   ##
================================================
  Coverage               ?   57.4555%           
================================================
  Files                  ?       1770           
  Lines                  ?     632320           
  Branches               ?          0           
================================================
  Hits                   ?     363303           
  Misses                 ?     245010           
  Partials               ?      24007           

Flag	Coverage Δ
integration	37.3714% <0.0000%> (?)
unit	73.1574% <100.0000%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	52.8711% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	52.3030% <0.0000%> (?)

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, winoros

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• pkg/statistics/OWNERS [hawkingrei,winoros]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-01-08 08:16:33.115714911 +0000 UTC m=+341536.404546616: ☑️ agreed by hawkingrei.
• 2025-01-13 06:07:12.227182179 +0000 UTC m=+765775.516013885: ☑️ agreed by winoros.