Move simplecov start to config and require to spec_helper (#39236)

.simplecov

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-SimpleCov.start 'rails' do
+SimpleCov.configure do
   # During parallel runs, ensure unique names for post-run merge
   command_name "job-#{ENV['TEST_ENV_NUMBER']}" if ENV['TEST_ENV_NUMBER']
 

spec/rails_helper.rb

@@ -2,8 +2,6 @@
 
 ENV['RAILS_ENV'] ||= 'test'
 
-require 'simplecov' if ENV.fetch('COVERAGE', false)
-
 # This needs to be defined before Rails is initialized
 STREAMING_PORT = ENV.fetch('TEST_STREAMING_PORT', '4020')
 STREAMING_HOST = ENV.fetch('TEST_STREAMING_HOST', 'localhost')

spec/spec_helper.rb

@@ -1,5 +1,10 @@
 # frozen_string_literal: true
 
+if ENV.fetch('COVERAGE', false)
+  require 'simplecov'
+  SimpleCov.start 'rails'
+end
+
 RSpec.configure do |config|
   config.example_status_persistence_file_path = 'tmp/rspec/examples.txt'
   config.expect_with :rspec do |expectations|