operator: check store status for running operators (#4223)

[ti-chi-bot]

This is an automated cherry-pick of #4223

What problem does this PR solve?

Fix #3353

What is changed and how it works?

• For TransferLeader, AddLearner, AddPeer, check if the target store is down and cancel the operator if need.
• Other types of OperatorStep may or may not get blocked by down store, we don't restrict them in the PR.
• Add tests

Check List

Tests

• Unit test

Related changes

• Need to cherry-pick to the release branch

Release note

Fix the issue that operator can get blocked due to down store

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• lhy1024

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[disksing]

/merge

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[ti-chi-bot]

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

Commit hash: c82c555

[disksing]

/run-all-tests

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@ti-chi-bot: Your PR was out of date, I have automatically updated it for you.

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[disksing]

/merge

[ti-chi-bot]

@disksing: 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: 468d2fd

[disksing]

/run-all-tests

[disksing]

/run-all-tests

[disksing]

/run-all-tests

[codecov]

Codecov Report

Merging #4368 (468d2fd) into release-5.1 (9615a4a) will decrease coverage by 0.15%.
The diff coverage is 62.50%.

@@               Coverage Diff               @@
##           release-5.1    #4368      +/-   ##
===============================================
- Coverage        75.26%   75.10%   -0.16%     
===============================================
  Files              245      245              
  Lines            24710    24724      +14     
===============================================
- Hits             18598    18569      -29     
- Misses            4492     4523      +31     
- Partials          1620     1632      +12     

Flag	Coverage Δ
unittests	75.10% <62.50%> (-0.16%)	⬇️

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

Impacted Files	Coverage Δ
server/schedule/operator/step.go	68.55% <60.00%> (+0.79%)	⬆️
server/schedule/operator_controller.go	85.51% <100.00%> (+0.40%)	⬆️
server/schedulers/shuffle_hot_region.go	55.10% <0.00%> (-10.21%)	⬇️
server/schedule/region_scatterer.go	81.61% <0.00%> (-4.49%)	⬇️
server/region_syncer/client.go	79.68% <0.00%> (-3.91%)	⬇️
server/member/member.go	65.59% <0.00%> (-3.23%)	⬇️
server/tso/allocator_manager.go	78.13% <0.00%> (-1.84%)	⬇️
server/tso/tso.go	70.78% <0.00%> (-1.69%)	⬇️
server/config/persist_options.go	91.50% <0.00%> (-0.78%)	⬇️
server/grpc_service.go	47.66% <0.00%> (-0.69%)	⬇️
... and 9 more

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