pkg/webhook: unit test ResourceInterpreterCustomization

[mohamedawnallah]

Description

In this commit, we introduce unit tests for ValidationAdmission webhook for the ResourceInterpreterCustomization resource. The tests include:

• Tests how the webhook responds when decoding the request object fails.
• Tests how the webhook responds when it fails to retrieve list of objects from a namespace.
• Ensures that invalid ResourceInterpreterCustomization spec denies the admission.
• Confirms that valid ResourceInterpreterCustomization spec are allowed through without errors.

What type of PR is this?

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 34.17%. Comparing base (4c8bcd4) to head (466634a).
Report is 14 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5562      +/-   ##
==========================================
+ Coverage   34.14%   34.17%   +0.03%     
==========================================
  Files         643      643              
  Lines       44524    44524              
==========================================
+ Hits        15203    15217      +14     
+ Misses      28165    28151      -14     
  Partials     1156     1156              

Flag	Coverage Δ
unittests	34.17% <ø> (+0.03%)	⬆️

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[XiShanYongYe-Chang]

Thanks
/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

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