tests: fix unstable test TestMinResolvedTS

[lhy1024]

What problem does this PR solve?

Issue Number: Close #5589

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

 None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• CabinfeverB
• rleungx

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[codecov]

Codecov Report

Base: 75.72% // Head: 75.73% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (9987424) compared to base (72e558e).
Patch has no changes to coverable lines.

❗ Current head 9987424 differs from pull request most recent head 8eae9a8. Consider uploading reports for the commit 8eae9a8 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5669      +/-   ##
==========================================
+ Coverage   75.72%   75.73%   +0.01%     
==========================================
  Files         328      328              
  Lines       32560    32560              
==========================================
+ Hits        24655    24659       +4     
+ Misses       5792     5782      -10     
- Partials     2113     2119       +6     

Flag	Coverage Δ
unittests	75.73% <ø> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
pkg/errs/errs.go	75.00% <0.00%> (-25.00%)	⬇️
server/api/diagnostic.go	76.92% <0.00%> (-23.08%)	⬇️
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	74.71% <0.00%> (-6.90%)	⬇️
server/storage/kv/etcd_kv.go	79.71% <0.00%> (-5.80%)	⬇️
server/cluster/diagnostic_manager.go	72.04% <0.00%> (-4.31%)	⬇️
server/schedule/hbstream/heartbeat_streams.go	72.72% <0.00%> (-2.03%)	⬇️
server/schedule/operator_controller.go	86.26% <0.00%> (-1.13%)	⬇️
server/schedule/operator/step.go	74.48% <0.00%> (-0.77%)	⬇️
... and 14 more

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[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

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[ti-chi-bot]

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

Commit hash: 8eae9a8