Convert redis Counts for group::monitor

Problem

The metrics using IncidentCounter are still based on Redis and should be converted to Internal Events.

Desired Outcome

counts.status_page_incident_publishes and counts.status_page_incident_unpublishes are using Internal Events.

Potential Solution

Use the migration solution from #429556 (closed).

How to Verify

Incident Counter events should show the appropriate values in the newest automated service ping, e.g. on this dashboard with id 8b52effca410f0a380b0fcffaa1260e7