prepare_check: remove redundant check (#7217)

[ti-chi-bot]

This is an automated cherry-pick of #7217

What problem does this PR solve?

Issue Number: Ref #7016

What is changed and how does it work?

remove redundant check in prepare_check

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• CabinfeverB
• HuSharp

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[codecov]

Codecov Report

Attention: Patch coverage is 92.30769% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 75.46%. Comparing base (667abac) to head (ca7a746).

Files	Patch %	Lines
server/cluster/prepare_checker.go	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release-6.5    #7986      +/-   ##
===============================================
- Coverage        75.60%   75.46%   -0.14%     
===============================================
  Files              332      332              
  Lines            33787    33784       -3     
===============================================
- Hits             25543    25496      -47     
- Misses            6048     6079      +31     
- Partials          2196     2209      +13     

Flag	Coverage Δ
unittests	75.46% <92.30%> (-0.14%)	⬇️

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[HuSharp]

/merge

[ti-chi-bot]

@HuSharp: 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: ca7a746