Recreate Redis Counters using Snowplow events - Phase 2: Wave 5b -FE EVENTS

Summary

In &7493 (closed), we instrumented the first set of Redis Counters using Snowplow events in SaaS. This is the 5th wave of counters to be instrumented using Snowplow Events. Splitting this counter, redis_hll_counters.epics_usage.epics_usage_total_unique_counts_monthly, into its own issue per this comment since the counter is made up of many sub-metrics.

In #366827 (closed), the backend events needed for redis_hll_counters.epics_usage.epics_usage_total_unique_counts_monthly were instrumented. This issue is for a single FRONTEND event which is needed to ship this counter.

Submetric that needs to be migrated:

1. g_project_management_users_epic_issue_added_from_epic [FRONTEND EVENT]