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%.

:exclamation: 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

```diff @@ 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](https://app.codecov.io/gh/pingcap/tiup/pull/2310/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | Coverage Δ | | |---|---|---| | [cluster](https://app.codecov.io/gh/pingcap/tiup/pull/2310/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `?` | | | [dm](https://app.codecov.io/gh/pingcap/tiup/pull/2310/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `?` | | | [playground](https://app.codecov.io/gh/pingcap/tiup/pull/2310/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `15.24% <0.00%> (-0.05%)` | :arrow_down: | | [tiup](https://app.codecov.io/gh/pingcap/tiup/pull/2310/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `33.47% <ø> (ø)` | | | [unittest](https://app.codecov.io/gh/pingcap/tiup/pull/2310/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `22.37% <0.00%> (-<0.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files](https://app.codecov.io/gh/pingcap/tiup/pull/2310?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | Coverage Δ | | |---|---|---| | [components/playground/instance/pd.go](https://app.codecov.io/gh/pingcap/tiup/pull/2310?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap#diff-Y29tcG9uZW50cy9wbGF5Z3JvdW5kL2luc3RhbmNlL3BkLmdv) | `48.72% <ø> (ø)` | | | [components/playground/playground.go](https://app.codecov.io/gh/pingcap/tiup/pull/2310?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap#diff-Y29tcG9uZW50cy9wbGF5Z3JvdW5kL3BsYXlncm91bmQuZ28=) | `43.84% <0.00%> (-0.16%)` | :arrow_down: | ... and [204 files with indirect coverage changes](https://app.codecov.io/gh/pingcap/tiup/pull/2310/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap)

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[kaaaaaaang]

/lgtm

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

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

[kaaaaaaang]

/approve

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kaaaaaaang

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/pingcap/tiup/blob/master/OWNERS)~~ [kaaaaaaang] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment