*: fix TestMixedTSODeployment case

[rleungx]

What problem does this PR solve?

Issue Number: Close #6304.

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

[ti-chi-bot]

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[ti-chi-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.02 ⚠️

Comparison is base (3e6ac89) 75.13% compared to head (c31df3d) 75.11%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6312      +/-   ##
==========================================
- Coverage   75.13%   75.11%   -0.02%     
==========================================
  Files         404      404              
  Lines       39686    39698      +12     
==========================================
+ Hits        29819    29821       +2     
- Misses       7267     7275       +8     
- Partials     2600     2602       +2     

Flag	Coverage Δ
unittests	75.11% <100.00%> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
client/pd_service_discovery.go	86.72% <100.00%> (-0.48%)	⬇️
pkg/mcs/resource_manager/server/server.go	52.58% <100.00%> (-0.21%)	⬇️
pkg/mcs/tso/server/server.go	46.72% <100.00%> (-0.67%)	⬇️

... and 38 files with indirect coverage changes

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[ti-chi-bot]

PR needs rebase.

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[rleungx]

Close it since the original issue has been fixed.