br: Add pre-check of duplicate table in the downstream (#55044)

[ti-chi-bot]

This is an automated cherry-pick of #55044

What problem does this PR solve?

Issue Number: close #55087

Problem Summary:

What changed and how does it work?

Add a pre-check of duplicate table in the downstream.
If there are tables already existed downstream, restore task will fail and list all tables blocked the task.

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.

Add a pre-check of duplicate table in the downstream.
If there are tables already existed downstream, restore task will fail and list all tables blocked the task.

[ti-chi-bot]

@RidRisR 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]

[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/unit-test	09cb02f	link	true	/test unit-test
idc-jenkins-ci-tidb/mysql-test	09cb02f	link	true	/test mysql-test
idc-jenkins-ci-tidb/build	09cb02f	link	true	/test build
idc-jenkins-ci-tidb/check_dev	09cb02f	link	true	/test check-dev
idc-jenkins-ci-tidb/check_dev_2	09cb02f	link	true	/test check-dev2

Full PR test history. Your PR dashboard.

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