*: put the scheduler related logic together

[rleungx]

What problem does this PR solve?

Issue Number: Ref #5839.

What is changed and how does it work?

Part of #6418. Need to merge #6490 first.

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• binshi-bing
• nolouch

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[codecov]

Codecov Report

Patch coverage: 90.12% and project coverage change: +0.14 🎉

Comparison is base (e532925) 75.01% compared to head (0e8a15c) 75.15%.

❗ Current head 0e8a15c differs from pull request most recent head 801005e. Consider uploading reports for the commit 801005e to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6491      +/-   ##
==========================================
+ Coverage   75.01%   75.15%   +0.14%     
==========================================
  Files         410      410              
  Lines       41894    41840      -54     
==========================================
+ Hits        31425    31444      +19     
+ Misses       7713     7661      -52     
+ Partials     2756     2735      -21     

Flag	Coverage Δ
unittests	75.15% <90.12%> (+0.14%)	⬆️

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

Impacted Files	Coverage Δ
pkg/keyspace/keyspace.go	61.75% <ø> (ø)
pkg/schedule/checker/checker_controller.go	80.00% <ø> (ø)
pkg/schedule/checker/joint_state_checker.go	57.89% <ø> (ø)
pkg/schedule/checker/learner_checker.go	72.72% <ø> (ø)
pkg/schedule/checker/merge_checker.go	70.99% <ø> (ø)
pkg/schedule/checker/priority_inspector.go	81.08% <ø> (ø)
pkg/schedule/checker/replica_checker.go	67.80% <ø> (ø)
pkg/schedule/checker/replica_strategy.go	86.00% <ø> (ø)
pkg/schedule/checker/rule_checker.go	82.41% <ø> (ø)
pkg/schedule/checker/split_checker.go	68.18% <ø> (ø)
... and 45 more

... and 35 files with indirect coverage changes

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[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

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[ti-chi-bot]

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

Commit hash: 3bbbe69

[ti-chi-bot]

@rleungx: Your PR was out of date, I have automatically updated it for you.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