region scatter client: retry scatter regions when finished percentage is not 100. (#64884)

[ti-chi-bot]

This is an automated cherry-pick of #64884

This PR is cherry-picked from #60315

What problem does this PR solve?

Issue Number: ref #60077

Problem Summary:

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

[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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[ti-chi-bot]

@Leavrth 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: ## If you want to know how to resolve it, please read the guide in TiDB Dev Guide.

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[ti-chi-bot]

[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/mysql-test	a1c0be7	link	true	/test mysql-test
idc-jenkins-ci-tidb/build	a1c0be7	link	true	/test build
pull-br-integration-test	a1c0be7	link	true	/test pull-br-integration-test
idc-jenkins-ci-tidb/check_dev_2	a1c0be7	link	true	/test check-dev2
idc-jenkins-ci-tidb/check_dev	a1c0be7	link	true	/test check-dev
idc-jenkins-ci-tidb/unit-test	a1c0be7	link	true	/test unit-test

Full PR test history. Your PR dashboard.

Details

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[Leavrth]

cherry-picked by #62288