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]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• CabinfeverB
• rleungx

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[codecov]

Codecov Report

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

Comparison is base (542fde9) 75.56% compared to head (c726ae7) 75.66%.

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

Additional details and impacted files

@@               Coverage Diff               @@
##           release-6.5    #7686      +/-   ##
===============================================
+ Coverage        75.56%   75.66%   +0.09%     
===============================================
  Files              332      332              
  Lines            33757    33758       +1     
===============================================
+ Hits             25510    25542      +32     
+ Misses            6046     6026      -20     
+ Partials          2201     2190      -11     

Flag	Coverage Δ
unittests	75.66% <85.71%> (+0.09%)	⬆️

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[CabinfeverB]

/merge

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

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/merge

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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:

/run-all-tests

You only need to trigger /merge once, and 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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[ti-chi-bot]

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

Commit hash: c726ae7