pkg/karmadactl/util: unit test apiclient

[mohamedawnallah]

Description

In this commit, we unit test the apiclient to verify the creation of a restconfig in both scenarios: when it exists and when it doesn't.

What type of PR is this?

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

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 71.42857% with 12 lines in your changes missing coverage. Please review.

Project coverage is 48.18%. Comparing base (8457cd2) to head (6ae8cfd).

Files with missing lines	Patch %	Lines
pkg/util/testing/helpers.go	75.00%	6 Missing and 3 partials ⚠️
pkg/karmadactl/util/apiclient/apiclient.go	50.00%	2 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5869      +/-   ##
==========================================
+ Coverage   48.10%   48.18%   +0.07%     
==========================================
  Files         663      664       +1     
  Lines       54769    54803      +34     
==========================================
+ Hits        26349    26405      +56     
+ Misses      26711    26684      -27     
- Partials     1709     1714       +5     

Flag	Coverage Δ
unittests	48.18% <71.42%> (+0.07%)	⬆️

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[zhzhuang-zju]

https://github.com/karmada-io/karmada/actions/runs/12002263981/job/33454119362?pr=5869#step:4:14995
pkg/search.TestUpdateResourceRegistryEventHandler/AddAllEventHandlers_TriggerUpdateResourceRegistryEvent_UpdatedResourceRegistryAddedToWorkQueue

/retest

[zhzhuang-zju]

/lgtm
thanks, ask @XiShanYongYe-Chang for another look

[XiShanYongYe-Chang]

Thanks guys
/assign

[XiShanYongYe-Chang]

/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• operator/OWNERS [XiShanYongYe-Chang]
• pkg/controllers/OWNERS [XiShanYongYe-Chang]
• pkg/karmadactl/OWNERS [XiShanYongYe-Chang]
• pkg/util/OWNERS [XiShanYongYe-Chang]

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