[WIP] 🌱 KCP: implement SSA caching

[sbueringer]

What this PR does / why we need it:
Follow-up to #8207

WIP => Contains the KCP propagation and the caching commit atm

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 #8146

[k8s-ci-robot]

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[sbueringer]

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

[sbueringer]

/close

I'll add the few lines of this PR in the other ssa caching PR

[k8s-ci-robot]

@sbueringer: Closed this PR.

In response to this:

/close

I'll add the few lines of this PR in the other ssa caching PR

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