scheduler: enable evict-slow-store by default.

[LykxSassinator]

What problem does this PR solve?

Issue Number: close #7564, ref tikv/tikv#15909

What is changed and how does it work?

Enable `evict-slow-store` scheduler by default.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

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:

• bufferflies
• rleungx

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[LykxSassinator]

/run-test retry=7

[ti-chi-bot]

PR needs rebase.

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[LykxSassinator]

/test

[ti-chi-bot]

@LykxSassinator: The /test command needs one or more targets.
The following commands are available to trigger required jobs:

• /test build

The following commands are available to trigger optional jobs:

• /test pull-integration-copr-test
• /test pull-integration-realcluster-test

Use /test all to run the following jobs that were automatically triggered:

• tikv/pd/ghpr_build

In response to this:

/test

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[LykxSassinator]

/test all

[codecov]

Codecov Report

Merging #7505 (be65232) into master (40c2523) will increase coverage by 0.07%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7505      +/-   ##
==========================================
+ Coverage   74.72%   74.79%   +0.07%     
==========================================
  Files         457      457              
  Lines       50341    50341              
==========================================
+ Hits        37615    37654      +39     
+ Misses       9384     9358      -26     
+ Partials     3342     3329      -13     

Flag	Coverage Δ
unittests	74.79% <ø> (+0.07%)	⬆️

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

[rleungx]

/merge

[ti-chi-bot]

@rleungx: 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.

If you have any questions about the PR merge process, please refer to pr process.

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[ti-chi-bot]

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

Commit hash: be65232