optimize webhook patchResponse function

[zmberg]

Ⅰ. Describe what this PR does

There is a risk that the current webhook patch method will cause some fields to be lost if the rollout references a low version of the api. For example, k8s 1.26 adds a new field topologySpreadConstraint.minDomains, the field will be lost after the webhook.

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[codecov-commenter]

Codecov Report

Merging #165 (1c7ada9) into master (72e1c0b) will decrease coverage by 0.10%.
The diff coverage is 0.00%.

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@@            Coverage Diff             @@
##           master     #165      +/-   ##
==========================================
- Coverage   43.44%   43.34%   -0.10%     
==========================================
  Files          50       50              
  Lines        5361     5373      +12     
==========================================
  Hits         2329     2329              
- Misses       2635     2647      +12     
  Partials      397      397              

Flag	Coverage Δ
unittests	43.34% <0.00%> (-0.10%)	⬇️

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

Impacted Files	Coverage Δ
...bhook/workload/mutating/workload_update_handler.go	31.80% <0.00%> (-1.41%)	⬇️

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[furykerry]

/lgtm

[zmberg]

/approve

[kruise-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: zmberg

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