br: fix insert gc failed due to slow schema reload (#57742)

[ti-chi-bot]

This is an automated cherry-pick of #57742

What problem does this PR solve?

Issue Number: close #57743

Problem Summary:

What changed and how does it work?

Wait until schema info finished reloading before proceeding to the rest of the restore process,
Added test to first to reproduce the issue and then add the fix to verify the issue has been fixed (TDD)

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.

Fixed loading schema taking long time during restore causing insertGc row and other operations to fail  

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 52 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-8.5@a3a2e73). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.5     #57907   +/-   ##
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  Coverage               ?   56.9742%           
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  Files                  ?       1772           
  Lines                  ?     626932           
  Branches               ?          0           
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  Hits                   ?     357190           
  Misses                 ?     245568           
  Partials               ?      24174           

Flag	Coverage Δ
integration	36.8973% <0.0000%> (?)
unit	72.6108% <0.0000%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	52.9478% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	52.2622% <0.0000%> (?)

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 3pointer, lance6716

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Needs approval from an approver in each of these files:

• br/OWNERS [3pointer]
• pkg/domain/OWNERS [lance6716]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-03 06:35:45.54627227 +0000 UTC m=+1136733.165926777: ☑️ agreed by 3pointer.
• 2024-12-03 06:39:31.318012235 +0000 UTC m=+1136958.937666748: ☑️ agreed by lance6716.