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]

/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: f272ff8

[codecov]

Codecov Report

Base: 75.01% // Head: 74.89% // Decreases project coverage by -0.11% ⚠️

Coverage data is based on head (f272ff8) compared to base (fd64d04).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-5.0    #5464      +/-   ##
===============================================
- Coverage        75.01%   74.89%   -0.12%     
===============================================
  Files              245      245              
  Lines            24486    24487       +1     
===============================================
- Hits             18368    18340      -28     
- Misses            4499     4524      +25     
- Partials          1619     1623       +4     

Flag	Coverage Δ
unittests	74.89% <100.00%> (-0.12%)	⬇️

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	89.76% <100.00%> (ø)
server/member/member.go	65.21% <0.00%> (-3.27%)	⬇️
server/tso/allocator_manager.go	75.08% <0.00%> (-3.16%)	⬇️
server/election/leadership.go	83.52% <0.00%> (-2.36%)	⬇️
client/base_client.go	82.47% <0.00%> (-2.07%)	⬇️
server/statistics/hot_peer_cache.go	93.19% <0.00%> (-1.28%)	⬇️
pkg/btree/btree.go	85.30% <0.00%> (-0.97%)	⬇️
server/config/persist_options.go	92.60% <0.00%> (-0.78%)	⬇️
server/schedule/operator/step.go	67.82% <0.00%> (-0.64%)	⬇️
... and 8 more

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