Merge branch 'system_check_in_coverage_reports' into 'master'

Include lib/system_check in coverage reports

See merge request gitlab-org/gitlab!74763

spec/simplecov_env.rb

@@ -53,7 +53,6 @@ module SimpleCovEnv
       add_filter '/bin/'
       add_filter 'db/fixtures/' # Matches EE files as well
       add_filter '/lib/gitlab/sidekiq_middleware/'
-      add_filter '/lib/system_check/'
 
       add_group 'Channels',     'app/channels' # Matches EE files as well
       add_group 'Controllers',  'app/controllers' # Matches EE files as well