scheduler: evict hot leader first

[rleungx]

What problem does this PR solve?

Issue Number: Close #8949

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

None.

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Codecov Report

Attention: Patch coverage is 83.20000% with 21 lines in your changes missing coverage. Please review.

Project coverage is 76.03%. Comparing base (873ea1e) to head (fc4bfdd).
Report is 27 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9275      +/-   ##
==========================================
- Coverage   76.05%   76.03%   -0.03%     
==========================================
  Files         470      475       +5     
  Lines       73051    74211    +1160     
==========================================
+ Hits        55562    56424     +862     
- Misses      14045    14260     +215     
- Partials     3444     3527      +83     

Flag	Coverage Δ
unittests	76.03% <83.20%> (-0.03%)	⬇️

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[Tema]

@rleungx could you please share more background about this change?

[mittalrishabh]

@rleungx we also have few ideas on how to handle hot regions especially in stale reads/follower reads environment. We should collaborate on this feature.

[rleungx]

@Tema @mittalrishabh We are going to resolve #8949. This PR is just a draft now and is used for internal testing.

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@rleungx: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-unit-test-next-gen-2	594b292	link	true	/test pull-unit-test-next-gen-2
pull-unit-test-next-gen-3	594b292	link	true	/test pull-unit-test-next-gen-3
pull-unit-test-next-gen-1	594b292	link	true	/test pull-unit-test-next-gen-1

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