Migrates metrics definition for RedisHLL events in
[common.yml](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/usage_data_counters/known_events/common.yml)
with `category: incident_management`, to use instrumentation class

This category includes:

14 metrics + 1 total for `incident_management` 1 metric for
`incident_management_alerts` 1 metric for `incident_management_oncall`

Issue: https://gitlab.com/gitlab-org/gitlab/-/issues/333117