Fix fast_spec_helper and add a test for it

.gitlab-ci.yml

@@ -684,6 +684,11 @@ rspec-mysql:
   <<: *only-schedules-master
   parallel: 50
 
+rspec-fast-spec-helper:
+  <<: *rspec-metadata-pg
+  script:
+    - bundle exec rspec spec/fast_spec_helper.rb
+
 .rspec-quarantine: &rspec-quarantine
   <<: *only-schedules-master
   script:

spec/support/helpers/stub_configuration.rb

@@ -121,4 +121,5 @@ module StubConfiguration
   end
 end
 
+require_relative '../../../ee/spec/support/helpers/ee/stub_configuration'
 StubConfiguration.prepend(EE::StubConfiguration)

spec/support/helpers/stub_object_storage.rb

@@ -74,4 +74,5 @@ module StubObjectStorage
   end
 end
 
+require_relative '../../../ee/spec/support/helpers/ee/stub_object_storage'
 StubObjectStorage.prepend(EE::StubObjectStorage)