scheduler: add aduit log for scheduler config API and add resp msg for evict-leader (#7674)

[ti-chi-bot]

This is an automated cherry-pick of #7674

What problem does this PR solve?

Issue Number: Close #7672

What is changed and how does it work?

Check List

Tests

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

[2024/01/08 11:20:31.719 +08:00] [INFO] [audit.go:126] ["audit log"] [service-info="{ServiceLabel:HandleSchedulerConfig, Method:HTTP/1.1/DELETE:/pd/api/v1/scheduler-config/evict-leader-scheduler/delete/2, CallerID:pd-ctl, IP:127.0.0.1 , Port:58671, StartTime:2024-01-08 11:20:31 +0800 CST, URLParam:{}, BodyParam:}"]
[2024/01/08 11:21:06.896 +08:00] [INFO] [audit.go:126] ["audit log"] [service-info="{ServiceLabel:HandleSchedulerConfig, Method:HTTP/1.1/POST:/pd/api/v1/scheduler-config/evict-leader-scheduler/config, CallerID:pd-ctl, IP:127.0.0.1, Po rt:58851, StartTime:2024-01-08 11:21:06 +0800 CST, URLParam:{}, BodyParam:{"name":"evict-leader-scheduler","store_id":2}}"]
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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• HuSharp
• rleungx

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[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (6ffd9ca) 74.79% compared to head (45f9865) 74.78%.

❗ Current head 45f9865 differs from pull request most recent head ffdf35c. Consider uploading reports for the commit ffdf35c to get more accurate results

Files	Patch %	Lines
server/api/router.go	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release-7.1    #7687      +/-   ##
===============================================
- Coverage        74.79%   74.78%   -0.01%     
===============================================
  Files              411      411              
  Lines            41669    41649      -20     
===============================================
- Hits             31166    31147      -19     
+ Misses            7761     7760       -1     
  Partials          2742     2742              

Flag	Coverage Δ
unittests	74.78% <85.71%> (-0.01%)	⬇️

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[CabinfeverB]

/merge

[ti-chi-bot]

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

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[ti-chi-bot]

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

Commit hash: 45f9865

[ti-chi-bot]

@ti-chi-bot: Your PR was out of date, I have automatically updated it for you.

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