Support graceful shutdown in TiFlash (release-7.5) (#10299)

[ti-chi-bot]

This is an automated cherry-pick of #10299 and #10313 and #10317

What problem does this PR solve?

Issue Number: close #10266

Problem Summary:

What is changed and how it works?

Should merge #10298 first.

Support graceful shutdown in TiFlash again

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

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

Support graceful shutdown in TiFlash

[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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[JaySon-Huang]

/test pull-integration-test

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gengliqi, JaySon-Huang

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• OWNERS [JaySon-Huang,gengliqi]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-07-15 14:57:44.633333386 +0000 UTC m=+2616517.356512363: ☑️ agreed by gengliqi.
• 2025-07-15 15:55:47.595597755 +0000 UTC m=+2620000.318776736: ☑️ agreed by JaySon-Huang.

[JaySon-Huang]

/test pull-integration-test

[ti-chi-bot]

@ti-chi-bot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-integration-test	63cf668	link	true	/test pull-integration-test

Full PR test history. Your PR dashboard.

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