pkg/karmadactl: unit test describe

[mohamedawnallah]

Description

In this commit, we unit test describe command on karmadactl by creating a fake rest client builder and make sure the described k8s object returned successfully when the command submitted.

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 Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.31%. Comparing base (6795dba) to head (844dffe).
Report is 14 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5847      +/-   ##
==========================================
+ Coverage   46.02%   46.31%   +0.29%     
==========================================
  Files         660      661       +1     
  Lines       53987    54308     +321     
==========================================
+ Hits        24848    25154     +306     
- Misses      27521    27526       +5     
- Partials     1618     1628      +10     

Flag	Coverage Δ
unittests	46.31% <100.00%> (+0.29%)	⬆️

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