chore: remove dependency on sigs.k8s.io/kustomize/api/image (#8529)

[free6om]

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[codecov]

Codecov Report

Attention: Patch coverage is 72.97297% with 10 lines in your changes missing coverage. Please review.

Project coverage is 65.03%. Comparing base (f27e82f) to head (5920eeb).
Report is 1 commits behind head on release-0.9.

Files with missing lines	Patch %	Lines
pkg/controller/instanceset/instance_util.go	72.97%	9 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release-0.9    #8540      +/-   ##
===============================================
+ Coverage        64.88%   65.03%   +0.15%     
===============================================
  Files              358      358              
  Lines            45659    45694      +35     
===============================================
+ Hits             29626    29719      +93     
+ Misses           13391    13346      -45     
+ Partials          2642     2629      -13     

Flag	Coverage Δ
unittests	65.03% <72.97%> (+0.15%)	⬆️

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