parser: support pre-split global index add special comment support for pre_split index option (#58408)

[ti-chi-bot]

This is an automated cherry-pick of #58408

What problem does this PR solve?

Issue Number: ref #57552, ref #57551

Problem Summary:

Wrap the pre_split index option with the special comment to avoid TiCDC failing to sync downstream.

What changed and how does it work?

See code changes.

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]

@tangenta This PR has conflicts, I have hold it.
Please resolve them or ask others to resolve them, then comment /unhold to remove the hold label.

[ti-chi-bot]

@ti-chi-bot: 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_2	59ce83d	link	true	/test check-dev2
idc-jenkins-ci-tidb/mysql-test	59ce83d	link	true	/test mysql-test
idc-jenkins-ci-tidb/build	59ce83d	link	true	/test build
idc-jenkins-ci-tidb/unit-test	59ce83d	link	true	/test unit-test
idc-jenkins-ci-tidb/check_dev	59ce83d	link	true	/test check-dev

Full PR test history. Your PR dashboard.

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[Benjamin2037]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Benjamin2037
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Needs approval from an approver in each of these files:

• OWNERS [Benjamin2037]
• pkg/ddl/OWNERS [Benjamin2037]
• pkg/parser/OWNERS

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-02-27 08:57:58.720818629 +0000 UTC m=+519026.673976892: ☑️ agreed by Benjamin2037.

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick:

1. It must be approved by the approvers firstly.
2. AFTER it has been approved by approvers, please wait for the cherry-pick merging approval from triage owners.

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