schedule: not limit remove peer of the down store

[rleungx]

What problem does this PR solve?

Close #4090.

What is changed and how it works?

This PR adds a flag in the remove peer step to let the store limit not work when the remove store is down.

Check List

Tests

• Unit test

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• disksing
• nolouch

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[codecov]

Codecov Report

Merging #4097 (8408f4e) into master (5b1896e) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4097      +/-   ##
==========================================
+ Coverage   74.46%   74.49%   +0.02%     
==========================================
  Files         258      258              
  Lines       26314    26323       +9     
==========================================
+ Hits        19595    19609      +14     
  Misses       4973     4973              
+ Partials     1746     1741       -5     

Flag	Coverage Δ
unittests	74.49% <100.00%> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
server/schedule/checker_controller.go	66.66% <100.00%> (+0.70%)	⬆️
server/schedule/operator/builder.go	88.10% <100.00%> (-0.29%)	⬇️
server/schedule/operator/step.go	69.40% <100.00%> (+1.96%)	⬆️
server/schedule/placement/label_constraint.go	86.36% <0.00%> (-9.10%)	⬇️
server/kv/etcd_kv.go	72.46% <0.00%> (-7.25%)	⬇️
server/tso/local_allocator.go	71.62% <0.00%> (-6.76%)	⬇️
server/election/lease.go	84.12% <0.00%> (-4.77%)	⬇️
server/encryptionkm/key_manager.go	71.78% <0.00%> (-1.66%)	⬇️
server/tso/allocator_manager.go	67.16% <0.00%> (-1.17%)	⬇️
pkg/btree/btree.go	85.78% <0.00%> (-0.97%)	⬇️
... and 13 more

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[HunDunDM]

I will have no way to limit it?

[rleungx]

@HunDunDM @nolouch PTAL

[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: 8408f4e

[nolouch]

/run-unit-test

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #4113.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #4114.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #4115.