Track epics created [RUN ALL RSPEC] [RUN AS-IF-FOSS]

Merged Felipe Artur requested to merge issue_292253-epic_created_counter into master

What does this MR do?

Track epics created with Redis counters.
The tracking functionality is behind a feature flag: :track_epics_activity defaulted to on.

related to #292253 (closed)

Edited by Felipe Artur