*: enable error check for mcs, keyspace and labeler

[rleungx]

What problem does this PR solve?

Issue Number: Ref #1919.

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

None.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 14.28571% with 12 lines in your changes missing coverage. Please review.

Project coverage is 77.31%. Comparing base (463aee9) to head (e541372).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #8288 +/- ## ========================================== - Coverage 77.39% 77.31% -0.08% ========================================== Files 470 470 Lines 61387 61392 +5 ========================================== - Hits 47508 47464 -44 - Misses 10315 10372 +57 + Partials 3564 3556 -8 ``` | [Flag](https://app.codecov.io/gh/tikv/pd/pull/8288/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=tikv) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/tikv/pd/pull/8288/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=tikv) | `77.31% <14.28%> (-0.08%)` | :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=tikv#carryforward-flags-in-the-pull-request-comment) to find out more.

[ti-chi-bot[bot]]

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[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: HuSharp, okJiang

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-06-14 09:56:40.146028361 +0000 UTC m=+717754.199340283: :ballot_box_with_check: agreed by HuSharp.

[rleungx]

/merge

[ti-chi-bot[bot]]

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