tests: make TestUpdateAfterResetTSO stable

[lhy1024]

What problem does this PR solve?

Issue Number: Close #7381

What is changed and how does it work?

Check List

Tests

• Unit test
• Manual test

for i in {1..100}
do
	go test -timeout 120s -run ^TestMicroserviceTSOClient$ github.com/tikv/pd/tests/integrations/tso
	go clean -testcache
done

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• CabinfeverB
• HuSharp

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[codecov]

Codecov Report

Merging #7385 (09e89bb) into master (a6800a9) will decrease coverage by 0.11%.
The diff coverage is 100.00%.

❗ Current head 09e89bb differs from pull request most recent head 68a03c2. Consider uploading reports for the commit 68a03c2 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7385      +/-   ##
==========================================
- Coverage   74.34%   74.24%   -0.11%     
==========================================
  Files         451      451              
  Lines       48897    48888       -9     
==========================================
- Hits        36352    36296      -56     
- Misses       9327     9377      +50     
+ Partials     3218     3215       -3     

Flag	Coverage Δ
unittests	74.24% <100.00%> (-0.11%)	⬇️

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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

You only need to trigger /merge once, and if the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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[ti-chi-bot]

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

Commit hash: 09e89bb

[ti-chi-bot]

@lhy1024: Your PR was out of date, I have automatically updated it for you.

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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.