br: add GetTSWithRetry func (#38663)

[ti-chi-bot]

This is an automated cherry-pick of #38663

What problem does this PR solve?

Issue Number: ref #36910

Problem Summary:
When the switch of the leader occurs in the PD, it affect the BR restore checksum process.

What is changed and how it works?

Add GetTSWithRetry func to replace GetTS in execChecksum func

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

Manual Test

• run restore with injected error
• restore succeeded

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

Fix a bug that caused: When the switch of the leader occurs in the PD, it affect the BR restore checksum process.

[ti-chi-bot]

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[ti-chi-bot]

@ti-chi-bot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick, it must first be approved by the collaborators.

AFTER it has been approved by collaborators, please ping the release team in a comment to request a cherry pick review.

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[ti-chi-bot]

@ti-chi-bot: PR needs rebase.

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[MoCuishle28]

I have resolved the code conflicts and pushed the branch to my fork repo https://github.com/MoCuishle28/tidb/tree/cherry-pick-38663-to-release-6.1 because I don't have permission to modify the ti-chi-bot/tidb repo's code.
BTW I think maybe we should also cherry-pick this PR #38948.

[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	0ef3ae6	link	true	/test check-dev
idc-jenkins-ci-tidb/check_dev_2	0ef3ae6	link	true	/test check-dev2
idc-jenkins-ci-tidb/unit-test	0ef3ae6	link	true	/test unit-test
idc-jenkins-ci-tidb/build	0ef3ae6	link	true	/test build
idc-jenkins-ci-tidb/mysql-test	0ef3ae6	link	true	/test mysql-test

Full PR test history. Your PR dashboard.

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