fix: simplify cache management

[eddycharly]

This PR simplifies cache management.

[sonatype-lift]

typecheck: could not import k8s.io/apimachinery/pkg/util/sets (-: could not load export data: no export data for "k8s.io/apimachinery/pkg/util/sets")

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[fjogeleit]

@sonatype-lift ignore

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[coveralls]

Pull Request Test Coverage Report for Build 4132935210

• 22 of 22 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.005%) to 93.556%

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Totals
Change from base Build 4125664890:	0.005%
Covered Lines:	4007
Relevant Lines:	4283

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💛 - Coveralls

[fjogeleit]

should this be already added? its not set yet and as we discussed ModifiedItems are not really available

[eddycharly]

Mistake, fixed