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

[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 45.67%. Comparing base (8c7607e) to head (982ff71).
Report is 45 commits behind head on master.

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%   45.67%   +3.37%     
==========================================
  Files         655      658       +3     
  Lines       55851    53926    -1925     
==========================================
+ Hits        23622    24630    +1008     
+ Misses      30716    27689    -3027     
- Partials     1513     1607      +94     

Flag	Coverage Δ
unittests	45.67% <33.33%> (+3.37%)	⬆️

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[XiShanYongYe-Chang]

Hi @mohamedawnallah, the ci lint is failed, can you help fix it?

[mohamedawnallah]

@XiShanYongYe-Chang all test cases passed now :)

[XiShanYongYe-Chang]

Thanks @mohamedawnallah
/assign

[XiShanYongYe-Chang]

Other parts LGTM

[karmada-bot]

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