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Related to: harvester/harvester#4710
Related to: harvester/harvester#4709
This PR adds the business logic for accepting or mutating CloudInit resources. Since the CloudInit controller in the node-manager will be overwriting files in /oem, it's important that the webhook maintains a list of system-level files to prevent overwriting them, as well as to prevent the controller from allowing multiple CloudInit resources to affect the same single file under /oem.