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refactor(pubsub): replace custom Edgehog.PubSub with Ash.Notifier.PubSub

- Removed the legacy Edgehog.PubSub module and the PublishNotification change.
- Updated Deployment and OTAOperation resources to use Ash.Notifier.PubSub.
- Added pub_sub blocks with proper transforms to map Ash actions to legacy event types.
- Updated code subscribing to events to use Phoenix.PubSub directly.
- Adjusted tests to match new notification structure.

Signed-off-by: ArnelaL <arnela.lisic@secomind.com>