feat(rollout): automatically set partition if podTemplate of collaset controlled by rollout changes

[zoumo]

1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):

• N
• Y

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

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: Patch coverage is 0% with 22 lines in your changes missing coverage. Please review.

Project coverage is 65.59%. Comparing base (dab15ec) to head (2df33eb).

Files	Patch %	Lines
...rver/generic/collaset/collaset_mutating_handler.go	0.00%	22 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #230      +/-   ##
==========================================
- Coverage   65.76%   65.59%   -0.17%     
==========================================
  Files          73       73              
  Lines        5158     5180      +22     
==========================================
+ Hits         3392     3398       +6     
- Misses       1439     1457      +18     
+ Partials      327      325       -2     

Flag	Coverage Δ
unittests	65.59% <0.00%> (-0.17%)	⬇️

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