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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[HunDunDM]

/run-all-tests

[codecov]

Codecov Report

Base: 74.99% // Head: 75.07% // Increases project coverage by +0.07% 🎉

Coverage data is based on head (71f6cbf) compared to base (aa69e9f).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-5.3    #5461      +/-   ##
===============================================
+ Coverage        74.99%   75.07%   +0.07%     
===============================================
  Files              263      263              
  Lines            27360    27361       +1     
===============================================
+ Hits             20519    20541      +22     
+ Misses            5027     5013      -14     
+ Partials          1814     1807       -7     

Flag	Coverage Δ
unittests	75.07% <100.00%> (+0.07%)	⬆️

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

Impacted Files	Coverage Δ
server/schedule/operator/builder.go	86.49% <100.00%> (+0.02%)	⬆️
server/schedule/operator/create_operator.go	90.37% <100.00%> (ø)
pkg/tempurl/tempurl.go	45.00% <0.00%> (-15.00%)	⬇️
pkg/cache/lru.go	79.06% <0.00%> (-9.31%)	⬇️
server/tso/local_allocator.go	64.86% <0.00%> (-6.76%)	⬇️
server/election/leadership.go	75.25% <0.00%> (-2.07%)	⬇️
pkg/dashboard/adapter/manager.go	81.91% <0.00%> (-1.07%)	⬇️
pkg/btree/btree.go	85.78% <0.00%> (-0.97%)	⬇️
server/statistics/hot_peer_cache.go	96.12% <0.00%> (-0.78%)	⬇️
server/config/persist_options.go	92.80% <0.00%> (-0.76%)	⬇️
... and 16 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: 71f6cbf