br: Add goleak test for br integration test (#52741)

[ti-chi-bot]

This is an automated cherry-pick of #52741

What problem does this PR solve?

Issue Number: close #52696

Problem Summary:

What changed and how does it work?

1. Add goleak test for br integration tests
2. Add a 30 seconds expiration time for http idleconnections
3. reduce the number of http clients in stream_status
4. clean up some opened rpc clients
5. ignored some harmless goroutine leaks

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]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick:

1. It must be approved by the approvers firstly.
2. AFTER it has been approved by approvers, please wait for the cherry-pick merging approval from triage owners.

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[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

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign bornchanger for approval. For more information see the Code Review Process.

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[codecov]

Codecov Report

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

Please upload report for BASE (release-8.1@6ab9aa3). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.1     #59964   +/-   ##
================================================
  Coverage               ?   71.2216%           
================================================
  Files                  ?       1468           
  Lines                  ?     424038           
  Branches               ?          0           
================================================
  Hits                   ?     302007           
  Misses                 ?     101497           
  Partials               ?      20534           

Flag	Coverage Δ
unit	71.2216% <0.0000%> (?)

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

Components	Coverage Δ
dumpling	52.9656% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	41.4259% <0.0000%> (?)

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[BornChanger]

/test pull-br-integration-test

[tiprow]

@BornChanger: No presubmit jobs available for pingcap/[email protected]

In response to this:

/test pull-br-integration-test

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[RidRisR]

/test pull-br-integration-test

[tiprow]

@RidRisR: No presubmit jobs available for pingcap/[email protected]

In response to this:

/test pull-br-integration-test

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[BornChanger]

/test pull-br-integration-test

[tiprow]

@BornChanger: No presubmit jobs available for pingcap/[email protected]

In response to this:

/test pull-br-integration-test

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