Align sylva-capi-cluster and os-image-server on os_images

Cristian Mandarequested to merge
os-images-snakecase into main

What does this MR do and why?

Replaces the variable name osImages used by os-image-server with os_images used in s-c and s-c-c.

This relies on Use snake case for osImages (sylva-projects/sylva-elements/helm-charts/os-image-server!31 - merged)

Closes #942 (closed)

Edited by Thomas Morin

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