api: update evict-leader-scheduler&grant-leader-scheduler to return the same success message

[HuSharp]

What problem does this PR solve?

Issue Number: Ref #7672

What is changed and how does it work?

API scheduler need to keep consistent with

pd/pkg/schedule/schedulers/evict_leader.go

Line 395 in cd0ffba

handler.rd.JSON(w, http.StatusOK, "The scheduler has been applied to the store.")

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• CabinfeverB
• rleungx

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[HuSharp]

need to keep consistent with

pd/pkg/schedule/schedulers/evict_leader.go

Line 395 in cd0ffba

handler.rd.JSON(w, http.StatusOK, "The scheduler has been applied to the store.")

[codecov]

Codecov Report

Merging #7802 (4a55a66) into master (21ced9a) will decrease coverage by 0.05%.
Report is 2 commits behind head on master.
The diff coverage is 72.22%.

❗ Current head 4a55a66 differs from pull request most recent head 3e343d6. Consider uploading reports for the commit 3e343d6 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7802      +/-   ##
==========================================
- Coverage   73.55%   73.51%   -0.05%     
==========================================
  Files         432      432              
  Lines       47793    47795       +2     
==========================================
- Hits        35153    35135      -18     
- Misses       9612     9629      +17     
- Partials     3028     3031       +3     

Flag	Coverage Δ
unittests	73.51% <72.22%> (-0.05%)	⬇️

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

[HuSharp]

/merge

[ti-chi-bot]

@HuSharp: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

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

Commit hash: 4a55a66

[ti-chi-bot]

@HuSharp: Your PR was out of date, I have automatically updated it for you.

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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