Merge branch 'pl-rubocop-simplecov' into 'master'

Enable running simplecov in fast specs via `SIMPLECOV=1`

See merge request gitlab-org/gitlab!82500

spec/fast_spec_helper.rb

@@ -18,6 +18,9 @@ require_relative '../config/settings'
 require_relative 'support/rspec'
 require 'active_support/all'
 
+require_relative 'simplecov_env'
+SimpleCovEnv.start!
+
 unless ActiveSupport::Dependencies.autoload_paths.frozen?
   ActiveSupport::Dependencies.autoload_paths << 'lib'
   ActiveSupport::Dependencies.autoload_paths << 'ee/lib'

spec/rubocop/cop/database/establish_connection_spec.rb

 # frozen_string_literal: true
 
-require 'spec_helper'
+require 'fast_spec_helper'
 require_relative '../../../../rubocop/cop/database/establish_connection'
 
 RSpec.describe RuboCop::Cop::Database::EstablishConnection do