operator: allows to skip placement rules checks (#5458)

[ti-chi-bot]

This is an automated cherry-pick of #5458

What problem does this PR solve?

Issue Number: Close #5401

What is changed and how does it work?

Allows skipping placement rules checks when creating operators.

Check List

Tests

• Unit test

Code changes

Related changes

• Need to cherry-pick to the release branch

Release note

Fixed the bug where the Learner Peer of TiFlash Replica might not be created.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• JmPotato
• lhy1024

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[codecov]

Codecov Report

Base: 74.84% // Head: 74.94% // Increases project coverage by +0.10% 🎉

Coverage data is based on head (47fc6dc) compared to base (c7dcc3c).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-5.2    #5460      +/-   ##
===============================================
+ Coverage        74.84%   74.94%   +0.10%     
===============================================
  Files              249      249              
  Lines            25765    25766       +1     
===============================================
+ Hits             19283    19311      +28     
+ Misses            4786     4768      -18     
+ Partials          1696     1687       -9     

Flag	Coverage Δ
unittests	74.94% <100.00%> (+0.10%)	⬆️

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

Impacted Files	Coverage Δ
server/schedule/operator/builder.go	88.00% <100.00%> (+0.02%)	⬆️
server/schedule/operator/create_operator.go	90.15% <100.00%> (ø)
server/kv/etcd_kv.go	79.71% <0.00%> (-5.80%)	⬇️
pkg/dashboard/adapter/manager.go	79.78% <0.00%> (-5.32%)	⬇️
pkg/etcdutil/etcdutil.go	84.70% <0.00%> (-3.53%)	⬇️
server/member/member.go	63.10% <0.00%> (-2.14%)	⬇️
client/base_client.go	82.29% <0.00%> (-2.09%)	⬇️
server/schedule/operator_controller.go	83.56% <0.00%> (-1.99%)	⬇️
server/config/persist_options.go	92.69% <0.00%> (-0.77%)	⬇️
server/cluster/cluster.go	82.01% <0.00%> (-0.36%)	⬇️
... and 14 more

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[HunDunDM]

/merge

[ti-chi-bot]

@HunDunDM: 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: 47fc6dc