playground/log: add mcs name for pd log

[HuSharp]

What problem does this PR solve?

What is changed and how it works?

change log name for pd mcs

run ./tiup-playground nightly --pd.mode ms --pd.api 3 --pd.tso 2 --pd.rm 1
before

after

Check List

Tests

• Manual test (add detailed scripts or steps below)

Release notes:

NONE

[HuSharp]

cc @rleungx PTAL, thx!

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (da0221a) 53.39% compared to head (4dd84c7) 29.96%.

❗ Current head 4dd84c7 differs from pull request most recent head a756742. Consider uploading reports for the commit a756742 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #2310       +/-   ##
===========================================
- Coverage   53.39%   29.96%   -23.43%     
===========================================
  Files         325      311       -14     
  Lines       34725    32173     -2552     
===========================================
- Hits        18540     9640     -8900     
- Misses      13937    21447     +7510     
+ Partials     2248     1086     -1162     

Flag	Coverage Δ
cluster	?
dm	?
playground	15.24% <0.00%> (-0.05%)	⬇️
tiup	33.47% <ø> (ø)
unittest	22.37% <0.00%> (-<0.01%)	⬇️

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

Files	Coverage Δ
components/playground/instance/pd.go	48.72% <ø> (ø)
components/playground/playground.go	43.84% <0.00%> (-0.16%)	⬇️

... and 204 files with indirect coverage changes

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[kaaaaaaang]

/lgtm

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-11-13 07:54:05.107429941 +0000 UTC m=+4062842.694540071: ☑️ agreed by kaaaaaaang.

[kaaaaaaang]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kaaaaaaang

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