pkg/webhook: unit test propagation policy

[mohamedawnallah]

Description

In this commit, we introduce unit tests for both the ValidatingAdmission and MutatingAdmission webhooks for the PropagationPolicy resource.

The tests include:

• Validation webhook tests:

  • Tests how the webhook responds when decoding the request object fails.
  • Ensures that updates to the SchedulerName field are denied, as it should remain immutable.
  • Validates that changes to the PropagationPolicyPermanentIDLabel label and its absence in creation requests are correctly handled.
  • Confirms that valid PropagationPolicy objects are allowed through without errors.

• Mutation webhook tests:

  • Handles decode errors and denies admission when decoding fails.
  • Provides full coverage of policy mutation with default values and patch application.

What type of PR is this?

/kind failing-test
/kind feature

Which issue(s) this PR fixes:
Part of #5491

Does this PR introduce a user-facing change?:

NONE

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 32.42%. Comparing base (32c2ef7) to head (e2a3f59).
Report is 12 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5492      +/-   ##
==========================================
+ Coverage   31.70%   32.42%   +0.72%     
==========================================
  Files         643      643              
  Lines       44445    44473      +28     
==========================================
+ Hits        14090    14421     +331     
+ Misses      29325    28957     -368     
- Partials     1030     1095      +65     

Flag	Coverage Δ
unittests	32.42% <ø> (+0.72%)	⬆️

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[mohamedawnallah]

Closing and reopening some flaky e2e test failures...

[XiShanYongYe-Chang]

Hi @mohamedawnallah, can you help squash the commits into one?

[mohamedawnallah]

Hi @XiShanYongYe-Chang, I've squashed commits here into one and all subsequent UT PRs :)

[XiShanYongYe-Chang]

Thanks
/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: XiShanYongYe-Chang

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