Add email alert to node fidelity job

[jawebada]

As the operator of the Clair platform, or as an organization owner, I want to receive email notifications if no data is coming in from one or more sensor nodes.

Proposed solution: Use the already existing fidelity check and add an email alert to the node fidelity job. Send an email to the Clair platform operators if all nodes seem to be affected, otherwise send an email to members of the organization that have the role OWNER.

Add a status field to the installation model that indicates if fidelity notifications should be sent to OWNERs or not.

Complexity: 5
Value: 8
WSJF: 1.6