pkg/karmadactl: unit test apply command

[mohamedawnallah]

Description

In this commit, we unit test apply command on validation, and generating propagation objects.

What type of PR is this?

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

Does this PR introduce a user-facing change?:

NONE

[karmada-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 42.40%. Comparing base (8c7607e) to head (22f8199).

Files with missing lines	Patch %	Lines
pkg/karmadactl/apply/apply.go	33.33%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5785      +/-   ##
==========================================
+ Coverage   42.29%   42.40%   +0.10%     
==========================================
  Files         655      655              
  Lines       55851    55851              
==========================================
+ Hits        23622    23682      +60     
+ Misses      30716    30654      -62     
- Partials     1513     1515       +2     

Flag	Coverage Δ
unittests	42.40% <33.33%> (+0.10%)	⬆️

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