operator/pkg: add test helpers

[mohamedawnallah]

Description

Add test helpers that would be reused across tasks in the operator package.

What type of PR is this?

/kind cleanup

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 76 lines in your changes missing coverage. Please review.

Project coverage is 35.31%. Comparing base (8cc712f) to head (fdf7b53).
Report is 14 commits behind head on master.

Files with missing lines	Patch %	Lines
operator/pkg/tasks/init/test_helpers.go	0.00%	42 Missing ⚠️
operator/pkg/util/util.go	0.00%	26 Missing ⚠️
operator/pkg/tasks/deinit/test_helpers.go	0.00%	8 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5630      +/-   ##
==========================================
+ Coverage   35.19%   35.31%   +0.12%     
==========================================
  Files         645      647       +2     
  Lines       44869    45070     +201     
==========================================
+ Hits        15791    15918     +127     
- Misses      27846    27902      +56     
- Partials     1232     1250      +18     

Flag	Coverage Δ
unittests	35.31% <0.00%> (+0.12%)	⬆️

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[XiShanYongYe-Chang]

Thanks
/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• operator/OWNERS [XiShanYongYe-Chang]

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