🌱 Simplify cleanupConfigFields in KCP

[sbueringer]

Signed-off-by: Stefan Büringer [email protected]

What this PR does / why we need it:
Simplifying KCP logic ahead of the in-place implementation

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Part of #12291

[k8s-ci-robot]

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[sbueringer]

/test ?

[k8s-ci-robot]

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/test pull-cluster-api-e2e-latestk8s-main

/test pull-cluster-api-e2e-main

/test pull-cluster-api-e2e-mink8s-main

/test pull-cluster-api-e2e-upgrade-1-34-1-35-main

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[sbueringer]

/test pull-cluster-api-e2e-conformance-ci-latest-main
/test pull-cluster-api-e2e-conformance-main
/test pull-cluster-api-e2e-latestk8s-main
/test pull-cluster-api-e2e-main
/test pull-cluster-api-e2e-mink8s-main
/test pull-cluster-api-e2e-upgrade-1-34-1-35-main

[sbueringer]

/hold
Want to double-check something with Fabrizio

[sbueringer]

Tests all green, pushed some godoc changes. Won't trigger all e2e tests again just for that

[sbueringer]

/hold cancel