checker: fix the too many orphan peers cannot be removed (#6574)

[ti-chi-bot]

This is an automated cherry-pick of #6574

What problem does this PR solve?

Issue Number: Close #6573

What is changed and how does it work?

rule-checker: fix the too many orphan peers that cannot be removed
- let the health peer can be removed once there exist redundant

Check List

Tests

• Unit test

Release note

Fix the issue too many peers/learners cannot be removed

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• CabinfeverB

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.21 🎉

Comparison is base (0f65c6c) 74.76% compared to head (7bea134) 74.98%.

❗ Current head 7bea134 differs from pull request most recent head e7ee8bf. Consider uploading reports for the commit e7ee8bf to get more accurate results

Additional details and impacted files

@@               Coverage Diff               @@
##           release-7.1    #6576      +/-   ##
===============================================
+ Coverage        74.76%   74.98%   +0.21%     
===============================================
  Files              408      408              
  Lines            40740    40741       +1     
===============================================
+ Hits             30461    30551      +90     
+ Misses            7593     7532      -61     
+ Partials          2686     2658      -28     

Flag	Coverage Δ
unittests	74.98% <100.00%> (+0.21%)	⬆️

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

Impacted Files	Coverage Δ
pkg/schedule/checker/rule_checker.go	83.45% <100.00%> (+1.03%)	⬆️

... and 30 files with indirect coverage changes

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[nolouch]

/merge

[ti-chi-bot]

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[ti-chi-bot]

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

Details

Commit hash: 7bea134