checker: priority to fix orphan peers (#3522)

[ti-srebot]

cherry-pick #3522 to release-4.0
You can switch your code base to this Pull Request by using git-extras:

# In pd repo:
git pr https://github.com/tikv/pd/pull/3529

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/pd.git pr/3529:release-4.0-60508bde0819

---

What problem does this PR solve?

ref #3521
the problem is when offline a store, we may add learner multiple times if the operator is timeout.

What is changed and how it works?

Check List

Tests

• Unit test
• Manual test (add detailed scripts or steps below)

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tidb-ansible:
• Need to cherry-pick to the release branch

Release note

[ti-chi-bot]

[REVIEW NOTIFICATION]

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[ti-srebot]

@nolouch please accept the invitation then you can push to the cherry-pick pull requests.
https://github.com/ti-srebot/pd/invitations

[lhy1024]

plz fix conflict

[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: fd25878

[nolouch]

/rebuild

[nolouch]

rebuild

[nolouch]

/rebuild

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
15 Code Smells

No Coverage information
2.9% Duplication

[codecov]

Codecov Report

Merging #3529 (efe8dcf) into release-4.0 (a5addc4) will decrease coverage by 0.13%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           release-4.0    #3529      +/-   ##
===============================================
- Coverage        74.74%   74.61%   -0.14%     
===============================================
  Files              210      210              
  Lines            19831    19831              
===============================================
- Hits             14823    14797      -26     
- Misses            3672     3688      +16     
- Partials          1336     1346      +10     

Flag	Coverage Δ
unittests	74.61% <100.00%> (-0.14%)	⬇️

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	81.75% <100.00%> (ø)
pkg/tempurl/tempurl.go	60.00% <0.00%> (-10.00%)	⬇️
server/heartbeat_streams.go	65.93% <0.00%> (-6.60%)	⬇️
server/member/leader.go	63.76% <0.00%> (-6.43%)	⬇️
pkg/etcdutil/etcdutil.go	76.47% <0.00%> (-1.48%)	⬇️
server/server.go	72.84% <0.00%> (-1.33%)	⬇️
server/core/storage.go	67.53% <0.00%> (-0.87%)	⬇️
server/cluster/cluster.go	78.46% <0.00%> (-0.12%)	⬇️
server/grpc_service.go	59.87% <0.00%> (+0.40%)	⬆️
... and 2 more

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