An email sending feature in case of dataflow's failure

[zelima]

As a publisher, I want to be notified by Email if the processing of dataflows failed for some reason so that I am aware and I can fix

Acceptance Criteria

• [ ] Getting the email with small descriptions of what went wrong.

Tasks

• [ ] Do an analysis
• [ ] Define failures
• [ ] Come up with implementation plan

[zelima]

DUPLICATE of #284