enhancement: PodTransitionRule webhook rule refactor

[Eikykun]

1. Does this PR affect any open issues?(Y/N) and add issue references:

• N
• Y

2. What is the scope of this PR (e.g. component or file name):

pkg/webhook/server/generic/podtransitionrule

3. Provide a description of the PR(e.g. more details, effects, motivations or doc link):

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Other

4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):

• N
• Y

5. Are there test cases for these changes?(Y/N) select and add more details, references or doc links:

• Unit test
• Integration test
• Benchmark (add benchmark stats below)
• Manual test (add detailed scripts or steps below)
• Other

6. Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[codecov]

Codecov Report

Attention: 36 lines in your changes are missing coverage. Please review.

Comparison is base (b976c90) 59.38% compared to head (95746e1) 60.76%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
...llers/podtransitionrule/processor/rules/webhook.go	78.31%	32 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #131      +/-   ##
==========================================
+ Coverage   59.38%   60.76%   +1.38%     
==========================================
  Files          46       46              
  Lines        3489     3566      +77     
==========================================
+ Hits         2072     2167      +95     
+ Misses       1196     1184      -12     
+ Partials      221      215       -6     

Flag	Coverage Δ
unittests	60.76% <81.63%> (+1.38%)	⬆️

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[wu8685]

lgtm