Merge branch '339312-consider-running-rspec-frontend_fixture-in-parallel' into 'master'

Parallelize the 'rspec frontend_fixture' job on 2 nodes

See merge request gitlab-org/gitlab!68939

.gitlab/ci/frontend.gitlab-ci.yml

@@ -132,6 +132,7 @@ rspec frontend_fixture:
   extends:
     - .frontend-fixtures-base
     - .frontend:rules:default-frontend-jobs
+  parallel: 2
 
 rspec frontend_fixture as-if-foss:
   extends: