br: retry more time to get pd leader (#54059)

[ti-chi-bot]

This is an automated cherry-pick of #54059

What problem does this PR solve?

Issue Number: close #54017

Problem Summary:
the total retry time is only 1.5 seconds.

What changed and how does it work?

retry more time to get pd leader

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

[Leavrth]

/test pull-br-integration-test

[tiprow]

@Leavrth: No presubmit jobs available for pingcap/tidb@release-7.5

In response to this:

/test pull-br-integration-test

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-7.5@406ffe9). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #54873   +/-   ##
================================================
  Coverage               ?   72.0013%           
================================================
  Files                  ?       1413           
  Lines                  ?     411634           
  Branches               ?          0           
================================================
  Hits                   ?     296382           
  Misses                 ?      95361           
  Partials               ?      19891           

Flag	Coverage Δ
unit	72.0013% <0.0000%> (?)

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

Components	Coverage Δ
dumpling	52.9400% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	53.4983% <0.0000%> (?)

[ti-chi-bot]

@ti-chi-bot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-br-integration-test	cff4a07	link	false	/test pull-br-integration-test

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[BornChanger]

/retest

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• br/OWNERS [BornChanger,Leavrth]

Approvers can indicate their approval by writing /approve in a comment
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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-07-24 10:17:55.129609351 +0000 UTC m=+1040297.120550821: ☑️ agreed by BornChanger.
• 2024-07-24 11:29:39.976463643 +0000 UTC m=+1044601.967405112: ☑️ agreed by Leavrth.