ddl: fix rename index for expression indexes (#51984)

[ti-chi-bot]

This is an automated cherry-pick of #51984

What problem does this PR solve?

Issue Number: close #51431

Problem Summary:
Rename the virtual generated column when rename idx.

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@425cda9). Click here to learn what that means.
The diff coverage is 26.6666%.

Additional details and impacted files

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##             release-7.1     #52580   +/-   ##
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  Partials               ?      17821           

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-04-16 03:38:54.014088776 +0000 UTC m=+309353.125135217: ☑️ agreed by ywqzzy.
• 2024-04-16 03:39:29.191447236 +0000 UTC m=+309388.302493685: ☑️ agreed by tangenta.