Story:

This story one covers the reconciliation logic when a user sets spec.osImageStream to RHEL10 in a MachineConfigPool. The MCO must detect this change, look up the corresponding RHEL10 URL in the ConfigMap, and generate a new rendered MachineConfig so that new nodes in that pool are provisioned with RHEL10.

Acceptance Criteria:

1. The MCO is able to detect a change in the spec.osImageStream field of an empty MCP and react to it with a reconciliation.
2. It looks up and uses the correct URL for the RHEL10 stream from the ConfigMap.
3. It generates and applies a new rendered MachineConfig for the pool with the RHEL10 osImageUrl.
4. New nodes joining the pool are provisioned with RHEL10.