fix: addon controller adds support for checking if an addon is used by a cluster before deleting or disabling it.(#6434)

[skyrise-l]

fix #6434 : addon controller adds support for checking if an addon is used by a cluster before deleting or disabling it."

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[codecov]

Codecov Report

Attention: Patch coverage is 68.75000% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 64.86%. Comparing base (45dafd9) to head (ea423f8).
Report is 15 commits behind head on main.

Files	Patch %	Lines
controllers/extensions/addon_controller_stages.go	68.75%	6 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7170      +/-   ##
==========================================
+ Coverage   64.81%   64.86%   +0.05%     
==========================================
  Files         337      337              
  Lines       41828    41860      +32     
==========================================
+ Hits        27110    27152      +42     
+ Misses      12358    12348      -10     
  Partials     2360     2360              

Flag	Coverage Δ
unittests	64.86% <68.75%> (+0.05%)	⬆️

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