ci: Drop "success" job

It was added to make sure every pipeline for a merge request has at
least one job which passes (otherwise it's not possible to merge the
MR). Now the "sanity" job always exists in such pipelines, so this
isn't needed anymore.

Fixes: 4c41d1900e "ci: Add jobs running ci-fairy checks"
Reviewed-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12198>

.gitlab-ci.yml

@@ -54,7 +54,6 @@ stages:
   - software-renderer
   - layered-backends
   - deploy
-  - success
 
 # Generic rule to not run the job during scheduled pipelines
 # ----------------------------------------------------------
@@ -177,25 +176,6 @@ test-docs-mr:
     when:
       - runner_system_failure
 
-success:
-  stage: success
-  image: debian:stable-slim
-  rules:
-    - *ignore_scheduled_pipelines
-    - if: *is-post-merge
-      when: never
-    - if: *is-for-marge
-      changes: *docs-or-ci
-      when: never
-    - changes: *all_paths
-      when: never
-    - if: *is-pre-merge
-      when: on_success
-  variables:
-    GIT_STRATEGY: none
-  script:
-    - echo "Dummy job to make sure every merge request pipeline runs at least one job"
-
 
 .ci-deqp-artifacts:
   artifacts: