schedule: not limit remove peer of the down store (#4097)

[ti-chi-bot]

This is an automated cherry-pick of #4097

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:

• lhy1024
• nolouch

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

The full list of commands accepted by this bot can be found here.

Reviewer can indicate their review by submitting an approval review.
Reviewer can cancel approval by submitting a request changes review.

[lhy1024]

plz fix conflict

[nolouch]

/run-all-tests

[codecov]

Codecov Report

Merging #4113 (e972e61) into release-4.0 (f11d191) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           release-4.0    #4113   +/-   ##
============================================
  Coverage        74.97%   74.97%           
============================================
  Files              211      211           
  Lines            20065    20073    +8     
============================================
+ Hits             15044    15050    +6     
- Misses            3694     3696    +2     
  Partials          1327     1327           

Flag	Coverage Δ
unittests	74.97% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
server/schedule/checker/rule_checker.go	81.16% <ø> (ø)
server/schedule/checker_controller.go	75.00% <100.00%> (+0.71%)	⬆️
server/schedule/operator/builder.go	92.80% <100.00%> (+0.12%)	⬆️
server/schedule/operator/influence.go	85.71% <100.00%> (ø)
server/schedule/operator/step.go	62.41% <100.00%> (+0.54%)	⬆️
server/id/id.go	76.19% <0.00%> (-4.77%)	⬇️
pkg/etcdutil/etcdutil.go	77.94% <0.00%> (-2.95%)	⬇️
server/member/leader.go	63.76% <0.00%> (-2.76%)	⬇️
pkg/btree/btree.go	85.30% <0.00%> (-0.97%)	⬇️
server/server.go	73.94% <0.00%> (-0.49%)	⬇️
... and 5 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f11d191...e972e61. Read the comment docs.

[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

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[ti-chi-bot]

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

Commit hash: e972e61