Convert Redis metrics for group::package and registry to Internal Events

Problem

We want to get rid of Redis total counters to reduce confusion and maintenance effort.

All events using the PackageEventCounter are using Redis total counts. The complete list of events is in package_events.yml.

15 of these events are always reporting 0, so they might not be needed in general.

Desired Outcome

Check the steps mentioned in #433107 (comment 1856588406) to do the migration.

All metrics using events from package_events.yml are either converted to Internal Events or marked as removed if they are no longer needed.

Proposed Solution

TBD

How to verify

• Converted metrics still report correctly in the next automated service ping after deployment