Convert g_project_management_users_epic_issue_added_from_epic to Internal Events
Problem
g_project_management_users_epic_issue_added_from_epic
is part of epics_usage_total_unique_counts_monthly which we want to overall convert to internal events (see #421593 (closed)) It is separated out since it's a frontend event
Desired outcome
g_project_management_users_epic_issue_added_from_epic
is converted to internal events and all metrics relying on it
Potential solution
TBD