chore(deps): limit dependencies in favor of built-ins or core libs

[soltysh]

Description

This PR introduces two changes:

1. Replace controller-runtime helpers with k8s native client-go ones. Allowing us to drop direct dependency, although not entirely eliminating it due to transitive dependency through flux.
2. Replace custom helpers (helpers.RemoveMatches) with golang buitl-in slices counterparts.

Related Issue

Relates to #4895

Checklist before merging

• Test, docs, adr added or updated as needed
• Contributor Guide Steps followed

[netlify]

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[codecov]

Codecov Report

❌ Patch coverage is 20.00000% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/pkg/cluster/cluster.go	0.00%	2 Missing ⚠️
src/pkg/packager/remove.go	0.00%	2 Missing ⚠️

Files with missing lines	Coverage Δ
src/pkg/packager/pull.go	50.00% <100.00%> (ø)
src/pkg/cluster/cluster.go	49.77% <0.00%> (+0.33%)	⬆️
src/pkg/packager/remove.go	0.00% <0.00%> (ø)

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