*: make TestTSOKeyspaceGroupSplit stable

[rleungx]

What problem does this PR solve?

Issue Number: Close #7038.

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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• JmPotato

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[codecov]

Codecov Report

Merging #8059 (a3d9984) into master (5da6def) will increase coverage by 0.06%.
The diff coverage is n/a.

❗ Current head a3d9984 differs from pull request most recent head 0a632e4. Consider uploading reports for the commit 0a632e4 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8059      +/-   ##
==========================================
+ Coverage   77.30%   77.37%   +0.06%     
==========================================
  Files         468      468              
  Lines       60943    60943              
==========================================
+ Hits        47110    47152      +42     
+ Misses      10277    10245      -32     
+ Partials     3556     3546      -10     

Flag	Coverage Δ
unittests	77.37% <ø> (+0.06%)	⬆️

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[JmPotato]

/merge

[ti-chi-bot]

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[ti-chi-bot]

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

Commit hash: a3d9984

[ti-chi-bot]

@rleungx: Your PR was out of date, I have automatically updated it for you.

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