pkg/karmadactl/addons: unit test estimator

[mohamedawnallah]

Description

In this commit, we unit test karmada scheduler estimator on enabling, disabling, and status operations making sure they are working as expected.

Which issue(s) this PR fixes:
Part of #5491.
Depends on #5765.

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 42.45%. Comparing base (a935aa1) to head (dca9340).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5766      +/-   ##
==========================================
+ Coverage   42.33%   42.45%   +0.11%     
==========================================
  Files         656      656              
  Lines       55871    55871              
==========================================
+ Hits        23653    23719      +66     
+ Misses      30699    30617      -82     
- Partials     1519     1535      +16     

Flag	Coverage Δ
unittests	42.45% <ø> (+0.11%)	⬆️

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