tests: fix unstable test pdctl/TestScheduler

[lhy1024]

What problem does this PR solve?

Issue Number: Close #5667

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HunDunDM
• bufferflies

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[codecov]

Codecov Report

Base: 75.72% // Head: 75.68% // Decreases project coverage by -0.03% ⚠️

Coverage data is based on head (41f4b8d) compared to base (72e558e).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5668      +/-   ##
==========================================
- Coverage   75.72%   75.68%   -0.04%     
==========================================
  Files         328      328              
  Lines       32560    32560              
==========================================
- Hits        24655    24644      -11     
+ Misses       5792     5789       -3     
- Partials     2113     2127      +14     

Flag	Coverage Δ
unittests	75.68% <ø> (-0.04%)	⬇️

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

Impacted Files	Coverage Δ
server/tso/local_allocator.go	64.86% <0.00%> (-13.52%)	⬇️
...erver/config/service_middleware_persist_options.go	91.66% <0.00%> (-8.34%)	⬇️
pkg/dashboard/adapter/manager.go	73.56% <0.00%> (-8.05%)	⬇️
server/tso/tso.go	66.85% <0.00%> (-6.18%)	⬇️
server/member/member.go	63.68% <0.00%> (-2.11%)	⬇️
server/election/leadership.go	73.19% <0.00%> (-2.07%)	⬇️
server/schedule/hbstream/heartbeat_streams.go	72.72% <0.00%> (-2.03%)	⬇️
server/region_syncer/server.go	81.86% <0.00%> (-1.10%)	⬇️
server/schedule/operator_controller.go	86.48% <0.00%> (-0.91%)	⬇️
tools/pd-ctl/pdctl/command/hot_command.go	71.03% <0.00%> (-0.69%)	⬇️
... and 9 more

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[bufferflies]

rest LGTM

[lhy1024]

/merge

[ti-chi-bot]

@lhy1024: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: a310d83

[lhy1024]

/run-all-tests

[lhy1024]

/merge

[ti-chi-bot]

@lhy1024: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 41f4b8d