Move node-admin user settings to individual node-os values

Priya Goyalrequested to merge
add-user-data-per-os into main

This MR declares node-admin user settings per OS instead of per platform as the layout which rke2.additionalUserData.config needs (cloud-init or Butane) depends on the node OS.

Related to sylva-units HelmRelease install fails: schema validation error on cluster.rke2.additionalUserData.config (#4461) · Issue · sylva-projects/sylva-core

Partially co-authored by Claude AI

Edited by Priya Goyal

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