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: 75.25% // Head: 75.34% // Increases project coverage by +0.09% 🎉

Coverage data is based on head (007aacd) compared to base (a2fe396).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-5.1    #5459      +/-   ##
===============================================
+ Coverage        75.25%   75.34%   +0.09%     
===============================================
  Files              245      245              
  Lines            24802    24803       +1     
===============================================
+ Hits             18664    18689      +25     
+ Misses            4508     4493      -15     
+ Partials          1630     1621       -9     

Flag	Coverage Δ
unittests	75.34% <100.00%> (+0.09%)	⬆️

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

Impacted Files	Coverage Δ
server/schedule/operator/builder.go	88.12% <100.00%> (+0.02%)	⬆️
server/schedule/operator/create_operator.go	90.15% <100.00%> (ø)
server/tso/local_allocator.go	80.55% <0.00%> (-9.73%)	⬇️
pkg/cache/lru.go	79.06% <0.00%> (-9.31%)	⬇️
server/region_syncer/server.go	84.44% <0.00%> (-5.93%)	⬇️
server/region_syncer/client.go	79.84% <0.00%> (-3.88%)	⬇️
server/election/lease.go	94.91% <0.00%> (-1.70%)	⬇️
server/cluster/coordinator.go	72.74% <0.00%> (-1.19%)	⬇️
server/grpc_service.go	48.00% <0.00%> (-0.23%)	⬇️
client/client.go	71.82% <0.00%> (-0.14%)	⬇️
... and 8 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: 007aacd