ddl: add realtikv test case for merge temp index (#64436)

[ti-chi-bot]

This is an automated cherry-pick of #64436

What problem does this PR solve?

Issue Number: ref #61433

Problem Summary:

What changed and how does it work?

Add automated test cases for merge temp index stuck problem. In my test environment(MacBook Pro with Apple M4), this case takes about 16 second to complete. Before the commit #61445, this case will stuck and never success.

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]

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.

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[ti-chi-bot]

@fzzf678 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]

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[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/build	193e032	link	true	/test build
idc-jenkins-ci-tidb/unit-test	193e032	link	true	/test unit-test
idc-jenkins-ci-tidb/check_dev	193e032	link	true	/test check-dev
idc-jenkins-ci-tidb/check_dev_2	193e032	link	true	/test check-dev2

Full PR test history. Your PR dashboard.

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