Introduce Usage ping for artifacts:reports:junit

Count on pipeline/user scope, apply counter after commit, skip counter if no junit presented
Generate metric definition for junit report artifacts
Define event as option on metric definition
Update sidekiq worker definitions for Ci::TrackFailedBuildWorker
Use unified has_report? method on pipeline
Move clean_gitlab_redis_shared_state to the root level of spec
Test track_event calls
Make sure if the worker is being called after pipeline completion
Add rspec for multiple pipelines
Test complex scenario, when pipeline retried from failed fo success