ddl: fix unexpected delete ETCD value (#52504)

[ti-chi-bot]

This is an automated cherry-pick of #52504

What problem does this PR solve?

Issue Number: close #47060 and close #52335

Problem Summary:

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.

None

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-7.1@b955b70). Click here to learn what that means.
The diff coverage is 75.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.1     #52651   +/-   ##
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  Coverage               ?   73.4329%           
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  Lines                  ?     379891           
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  Hits                   ?     278965           
  Misses                 ?      83112           
  Partials               ?      17814           

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tangenta, wjhuang2016

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-04-16 22:27:44.822783831 +0000 UTC m=+377083.933830274: ☑️ agreed by tangenta.
• 2024-04-16 22:33:12.811496391 +0000 UTC m=+377411.922542836: ☑️ agreed by wjhuang2016.