pkg/karmadactl/addons/init: unit test enable and disable addon operations

[mohamedawnallah]

Description

In this commit, we unit test enable and disable addon operations that are utilized across all addons. The test cases include the general validation on passed inputs and expected outputs in addition to running the actual op enable/disable.

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

Does this PR introduce a user-facing change?:

NONE

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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Codecov Report

Attention: Patch coverage is 53.33333% with 7 lines in your changes missing coverage. Please review.

Project coverage is 42.44%. Comparing base (057cf86) to head (cb2f99b).

Files with missing lines	Patch %	Lines
pkg/karmadactl/addons/init/enable_option.go	46.15%	7 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5771      +/-   ##
==========================================
+ Coverage   42.31%   42.44%   +0.13%     
==========================================
  Files         655      655              
  Lines       55756    55761       +5     
==========================================
+ Hits        23591    23667      +76     
+ Misses      30651    30572      -79     
- Partials     1514     1522       +8     

Flag	Coverage Δ
unittests	42.44% <53.33%> (+0.13%)	⬆️

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