[WIP] ddl: revise duplicate error message format for ADD UNIQUE INDEX

[lyzx2001]

What problem does this PR solve?

Issue Number: close #53004

Problem Summary:
duplicate error message for ADD UNIQUE INDEX has wrong format.

What changed and how does it work?

revise duplicate error message format for ADD UNIQUE INDEX.

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

[ti-chi-bot]

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[tiprow]

Hi @lyzx2001. Thanks for your PR.

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[ti-chi-bot]

@lyzx2001: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/check_dev	0370a8f	link	true	/test check-dev
idc-jenkins-ci-tidb/build	0370a8f	link	true	/test build
idc-jenkins-ci-tidb/unit-test	0370a8f	link	true	/test unit-test

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[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 55.1288%. Comparing base (e785887) to head (0370a8f).
Report is 200 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #54012         +/-   ##
=================================================
- Coverage   72.5412%   55.1288%   -17.4125%     
=================================================
  Files          1508       1637        +129     
  Lines        431815     613369     +181554     
=================================================
+ Hits         313244     338143      +24899     
- Misses        99179     251898     +152719     
- Partials      19392      23328       +3936     

Flag	Coverage Δ
integration	23.0488% <25.0000%> (?)

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

Components	Coverage Δ
dumpling	52.9656% <ø> (ø)
parser	∅ <ø> (∅)
br	50.6705% <ø> (+8.4586%)	⬆️

[ti-chi-bot]

PR needs rebase.

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[lyzx2001]

solved by #54382