Merge branch '369871/remove_unused_groups_with_event_streaming_destinations_metric' into 'master'

Remove groups_with_event_streaming_destinations metric

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/173590



Merged-by: Michał Wielich <mwielich@gitlab.com>
Approved-by: Michał Wielich <mwielich@gitlab.com>
Co-authored-by: Andrew Jung <ajung@gitlab.com>