Revert "ci: add a final dd-gitlab/finished job (#10307)"

This reverts commit e94ed60.

.gitlab-ci.yml

@@ -56,16 +56,3 @@ deploy_to_di_backend:manual:
     UPSTREAM_COMMIT_AUTHOR: $CI_COMMIT_AUTHOR
     UPSTREAM_TAG: $CI_COMMIT_TAG
     UPSTREAM_PACKAGE_JOB: build
-
-
-# Final step which only runs when a pipeline has finished successfully.
-# This gives us something block on/wait for in GitHub
-finished:
-  image: registry.ddbuild.io/images/mirror/library/alpine:3.19.3
-  tags: [ "arch:amd64" ]
-  stage: .post
-  rules:
-    - when: on_success
-  script:
-    # TODO: Can we get this to reflect the status from the whole pipeline?
-    - exit 0