Merge branch 'telemetry-43-turn-on-auto-event-tracking-for-certain-users' into 'master'

Added group param to Snowplow FF

See merge request gitlab-org/gitlab-ee!14460

ee/app/views/layouts/_snowplow_additional_tracking.html.haml

-- return unless Feature.enabled?(:additional_snowplow_tracking)
+- return unless Feature.enabled?(:additional_snowplow_tracking, @group)
 
 :javascript
   window.snowplow('enableFormTracking');