Update tests and application

app/controllers/projects/application_controller.rb

app/services/git_push_service.rb

app/services/git_tag_push_service.rb

...elogs/unreleased/fix-support-for-external-ci-services.yml

lib/gitlab/ci/status/external/common.rb

spec/controllers/projects/pipelines_controller_spec.rb

spec/features/projects/features_visibility_spec.rb

spec/helpers/projects_helper_spec.rb

spec/lib/gitlab/ci/status/external/common_spec.rb

spec/policies/project_policy_spec.rb

spec/serializers/job_entity_spec.rb

spec/serializers/pipeline_details_entity_spec.rb

spec/serializers/stage_entity_spec.rb