executor: handle the corner case that temp index is not exist but the normal index is exist

[wjhuang2016]

What problem does this PR solve?

Issue Number: close #51784

Problem Summary:
If the temp index is not exist, we need to check if the normal index is exist.
The corner case is showed in the added unit test.

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.

fix a bug may cause unique index and data inconsistent when using insert ignore

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 16 lines in your changes missing coverage. Please review.

Project coverage is 55.4206%. Comparing base (b9d83d3) to head (ff5a2af).
Report is 1300 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #51862         +/-   ##
=================================================
- Coverage   70.6576%   55.4206%   -15.2371%     
=================================================
  Files          1481       1592        +111     
  Lines        439198     622375     +183177     
=================================================
+ Hits         310327     344924      +34597     
- Misses       109341     253927     +144586     
- Partials      19530      23524       +3994     

Flag	Coverage Δ
integration	37.0044% <32.5000%> (?)
unit	70.7146% <60.0000%> (+0.2594%)	⬆️

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

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	51.7481% <ø> (+5.9087%)	⬆️

[Benjamin2037]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Benjamin2037, zimulala

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Needs approval from an approver in each of these files:

• OWNERS [Benjamin2037,zimulala]
• pkg/ddl/OWNERS [Benjamin2037,zimulala]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-20 05:48:09.302316447 +0000 UTC m=+1442116.324562836: ☑️ agreed by Benjamin2037.
• 2024-03-22 09:24:56.480604473 +0000 UTC m=+1627923.502850861: ☑️ agreed by zimulala.

[wjhuang2016]

/retest

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.0: #52039.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #52499.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #53066.

[wjhuang2016]

/run-cherry-picker release-6.5

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #56092.