operator/pkg/karmadaresource/apiservice: unit test apiservice

[mohamedawnallah]

Description

In this commit, we unit test the api service in the karmada resource operator pkg.

What type of PR is this?

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

Dependency
This PR depends on #5602.

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 38.67%. Comparing base (0d55ead) to head (1474463).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5596      +/-   ##
==========================================
- Coverage   39.09%   38.67%   -0.43%     
==========================================
  Files         650      650              
  Lines       45209    55125    +9916     
==========================================
+ Hits        17676    21317    +3641     
- Misses      26180    32436    +6256     
- Partials     1353     1372      +19     

Flag	Coverage Δ
unittests	38.67% <ø> (-0.43%)	⬇️

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[mohamedawnallah]

cc @XiShanYongYe-Chang All test cases passed after rebasing on the master branch :)

[XiShanYongYe-Chang]

/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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