test: fix the stuck issue when use raw kv restore

[3pointer]

What problem does this PR solve?

Issue Number: ref #50701

Problem Summary:
#51777 introduce a problem that raw kv restore will getting into stuck (catched by integration test). because the default concurrencyPerStore is 0.

What changed and how does it work?

we don't need to handle backpressure issue when doing a raw restore. so we add a flag to skip.

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.

None

[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

[3pointer]

/ok-to-test

[tiprow]

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[3pointer]

/test pull-br-integration-test

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[codecov]

Codecov Report

Merging #51885 (6dbaf1a) into master (9b6db9d) will decrease coverage by 15.4535%.
Report is 3 commits behind head on master.
The diff coverage is 78.9473%.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #51885         +/-   ##
=================================================
- Coverage   70.7435%   55.2901%   -15.4535%     
=================================================
  Files          1477       1588        +111     
  Lines        438550     608497     +169947     
=================================================
+ Hits         310246     336439      +26193     
- Misses       108884     248503     +139619     
- Partials      19420      23555       +4135     

Flag	Coverage Δ
integration	37.8851% <78.9473%> (?)
unit	70.4711% <0.0000%> (-0.0720%)	⬇️

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

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	57.0714% <78.9473%> (+11.2428%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-19 08:28:18.835524936 +0000 UTC m=+1365325.857771323: ☑️ agreed by BornChanger.
• 2024-03-19 08:36:07.09094229 +0000 UTC m=+1365794.113188675: ☑️ agreed by Leavrth.

[BornChanger]

/retest

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.0: #51919.