Use os-images-info / image_key in s-c-c capm3

Cristian Mandarequested to merge
capm3-image-key into main

Extends the functionality from !1433 (merged) to also cover capm3 images in the same way

Adds the required values for sylva-projects/sylva-elements/helm-charts/sylva-capi-cluster!251 (merged)

Updates the os-images-info configmap to allow merging in s-c-c values

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