pkg/karmadactl: unit test exec

[mohamedawnallah]

Description

In this commit, we unit test exec on validating the execute options on control plane and member clusters.

What type of PR is this?

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

Does this PR introduce a user-facing change?:

NONE

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.22%. Comparing base (9416c08) to head (dc0279a).
Report is 19 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5873      +/-   ##
==========================================
- Coverage   46.30%   46.22%   -0.09%     
==========================================
  Files         661      663       +2     
  Lines       54308    54580     +272     
==========================================
+ Hits        25147    25227      +80     
- Misses      27536    27728     +192     
  Partials     1625     1625              

Flag	Coverage Δ
unittests	46.22% <100.00%> (-0.09%)	⬇️

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[XiShanYongYe-Chang]

/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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