Revert "Merge branch '412717-run-foss-jobs-in-foss' into 'master'"

.gitlab/ci/as-if-foss.gitlab-ci.yml

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

.gitlab/ci/preflight.gitlab-ci.yml

.gitlab/ci/qa.gitlab-ci.yml

.gitlab/ci/rails.gitlab-ci.yml

.gitlab/ci/rules.gitlab-ci.yml

.gitlab/ci/static-analysis.gitlab-ci.yml

doc/development/ee_features.md

doc/development/pipelines/index.md

scripts/rspec_helpers.sh

scripts/setup/generate-as-if-foss-env.rb

spec/dot_gitlab_ci/rules_spec.rb

spec/scripts/setup/generate_as_if_foss_env_spec.rb

spec/simplecov_env.rb