*: remove unnecessary interfaces

[rleungx]

What problem does this PR solve?

Issue Number: Ref #5839.

What is changed and how does it work?

After this PR, operator controller doesn't need to rely on the raft cluster anymore.

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lhy1024
• nolouch

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[codecov]

Codecov Report

Patch coverage: 86.59% and project coverage change: -0.03 ⚠️

Comparison is base (107b2a0) 74.64% compared to head (4b075f0) 74.61%.

❗ Current head 4b075f0 differs from pull request most recent head 3780edc. Consider uploading reports for the commit 3780edc to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6551      +/-   ##
==========================================
- Coverage   74.64%   74.61%   -0.03%     
==========================================
  Files         415      415              
  Lines       42581    42549      -32     
==========================================
- Hits        31783    31750      -33     
- Misses       7994     8002       +8     
+ Partials     2804     2797       -7     

Flag	Coverage Δ
unittests	74.61% <86.59%> (-0.03%)	⬇️

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

Impacted Files	Coverage Δ
pkg/core/basic_cluster.go	93.75% <ø> (ø)
pkg/core/region.go	88.97% <ø> (ø)
pkg/mock/mockcluster/mockcluster.go	93.84% <ø> (+0.80%)	⬆️
pkg/schedule/schedulers/grant_hot_region.go	54.60% <ø> (ø)
pkg/schedule/schedulers/grant_leader.go	68.15% <0.00%> (ø)
server/api/region.go	68.14% <0.00%> (ø)
pkg/schedule/operator/step.go	76.60% <55.55%> (ø)
pkg/schedule/operator/operator_controller.go	87.02% <66.66%> (+0.47%)	⬆️
pkg/schedule/coordinator.go	72.72% <90.00%> (-0.13%)	⬇️
pkg/schedule/diagnostic_manager.go	75.78% <90.00%> (+0.52%)	⬆️
... and 14 more

... and 29 files with indirect coverage changes

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[nolouch]

lgtm

[nolouch]

/merge

[ti-chi-bot]

@nolouch: 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: c3aa5fd

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@rleungx: Your PR was out of date, I have automatically updated it for you.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