DataNode: Merge provisioning periodicals state and steps with the process state machine

Merge the steps/state of the Certificate Provisioning periodicals into the OpenSearchProcess state machine so that we have only one place to add/change behaviour.

Currently provisioning is not part of the data node's state and handled in a separate flow


This leads to unnecessary and error-prone checks when trying to determine the exact status of data nodes. Additionally, the logic for transitioning is outside of the state machine's actions.