br: fix insert gc failed due to slow schema reload

[Tristan1900]

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  

[ti-chi-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[tiprow]

Hi @Tristan1900. Thanks for your PR.

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[Tristan1900]

/ok-to-test

[codecov]

Codecov Report

Attention: Patch coverage is 45.45455% with 30 lines in your changes missing coverage. Please review.

Project coverage is 74.7739%. Comparing base (2b03447) to head (b9d541a).
Report is 13 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #57742        +/-   ##
================================================
+ Coverage   72.8732%   74.7739%   +1.9007%     
================================================
  Files          1677       1723        +46     
  Lines        464202     475096     +10894     
================================================
+ Hits         338279     355248     +16969     
+ Misses       105016      97634      -7382     
- Partials      20907      22214      +1307     

Flag	Coverage Δ
integration	49.1942% <45.4545%> (?)
unit	72.2527% <0.0000%> (-0.0177%)	⬇️

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

Components	Coverage Δ
dumpling	52.7673% <ø> (ø)
parser	∅ <ø> (∅)
br	60.4999% <55.5555%> (+14.7963%)	⬆️

[Tristan1900]

/assign @Leavrth

[Tristan1900]

/assign @lance6716

[3pointer]

this function seems never return true?
because time.Since(time.Now()) is close to zero.

[Tristan1900]

you are absolutely right, that's a dumb mistake. but why did the test passed, let me take a look!

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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