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.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-6.5@cdffa79). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-6.5     #59583   +/-   ##
================================================
  Coverage               ?   73.6546%           
================================================
  Files                  ?       1098           
  Lines                  ?     353630           
  Branches               ?          0           
================================================
  Hits                   ?     260465           
  Misses                 ?      76434           
  Partials               ?      16731           

[BornChanger]

/unhold

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BornChanger, Leavrth

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [Leavrth]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-02-18 06:59:00.302621514 +0000 UTC m=+944582.698843575: ☑️ agreed by BornChanger.
• 2025-02-18 07:04:51.387461059 +0000 UTC m=+944933.783683121: ☑️ agreed by Leavrth.