ddl: fix vector indexes do not been dropped on TiFlash side

[Lloyd-Pottiger]

What problem does this PR solve?

Issue Number: close #59732

Problem Summary:

What changed and how does it work?

Send sync schema notification to TiFlash when it is a vector 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

[tiprow]

Hi @Lloyd-Pottiger. Thanks for your PR.

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[Lloyd-Pottiger]

/cc @zimulala @breezewish @JaySon-Huang

[Lloyd-Pottiger]

/cc @GMHDBJD

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.8150%. Comparing base (62165a4) to head (b156e40).
Report is 4 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #59733        +/-   ##
================================================
+ Coverage   72.9906%   74.8150%   +1.8244%     
================================================
  Files          1697       1743        +46     
  Lines        468948     477194      +8246     
================================================
+ Hits         342288     357013     +14725     
+ Misses       105575      97664      -7911     
- Partials      21085      22517      +1432     

Flag	Coverage Δ
integration	48.8167% <11.1111%> (?)
unit	72.1687% <100.0000%> (-0.0174%)	⬇️

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

Components	Coverage Δ
dumpling	52.6910% <ø> (ø)
parser	∅ <ø> (∅)
br	61.3192% <ø> (+16.2396%)	⬆️

[JaySon-Huang]

lgtm

[ti-chi-bot]

@JaySon-Huang: adding LGTM is restricted to approvers and reviewers in OWNERS files.

In response to this:

lgtm

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[JaySon-Huang]

/check-issue-triage-complete

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-02-25 04:00:41.431813622 +0000 UTC m=+328389.384971886: ☑️ agreed by breezewish.
• 2025-02-25 06:13:33.119323542 +0000 UTC m=+336361.072481810: ☑️ agreed by tangenta.

[zimulala]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: breezewish, JaySon-Huang, tangenta, zimulala

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• pkg/ddl/OWNERS [tangenta]

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[Lloyd-Pottiger]

/cherry-pick release-8.5

[ti-chi-bot]

@Lloyd-Pottiger: new pull request created to branch release-8.5: #59740.

In response to this:

/cherry-pick release-8.5

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