operator/pkg: unit test init and deinit

[mohamedawnallah]

Description

In this commit, we unit test the init and deinit workflows in the operator pkg.

What type of PR is this?

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

Dependency:
This PR depends on #5616, #5617, and #5630.

Does this PR introduce a user-facing change?:

NONE

[karmada-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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Needs approval from an approver in each of these files:

• operator/OWNERS

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 58.18182% with 23 lines in your changes missing coverage. Please review.

Project coverage is 36.36%. Comparing base (4c8bcd4) to head (1760599).
Report is 62 commits behind head on master.

Files with missing lines	Patch %	Lines
operator/pkg/test_helper.go	46.66%	10 Missing and 6 partials ⚠️
operator/pkg/controller/karmada/planner.go	0.00%	2 Missing ⚠️
operator/pkg/init.go	85.71%	1 Missing and 1 partial ⚠️
operator/pkg/util/kubeconfig.go	0.00%	2 Missing ⚠️
operator/pkg/deinit.go	85.71%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5613      +/-   ##
==========================================
+ Coverage   34.14%   36.36%   +2.21%     
==========================================
  Files         643      646       +3     
  Lines       44524    44891     +367     
==========================================
+ Hits        15203    16323    +1120     
+ Misses      28165    27302     -863     
- Partials     1156     1266     +110     

Flag	Coverage Δ
unittests	36.36% <58.18%> (+2.21%)	⬆️

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