gitlab-ci: Prefer MR rules for any pipeline associated with a MR

GitLab 13.3 started creating MR pipelines in the parent project of a MR
from a fork, at least when the MR submitter is a developer in the parent
project.  If the pipeline is associated with a MR, we should use the
corresponding rules regardless of which project hosts the pipeline.

.gitlab/rules.yml

@@ -2,17 +2,17 @@
 
 .run_manually:
     rules:
+        - if: '$CI_MERGE_REQUEST_ID'
+          when: manual
         - if: '$CI_PROJECT_PATH == "cmake/cmake"'
           when: delayed
           start_in: 5 minutes
-        - if: '$CI_MERGE_REQUEST_ID'
-          when: manual
         - when: never
 
 .run_automatically:
     rules:
-        - if: '$CI_PROJECT_PATH == "cmake/cmake"'
-          when: on_success
         - if: '$CI_MERGE_REQUEST_ID'
           when: on_success
+        - if: '$CI_PROJECT_PATH == "cmake/cmake"'
+          when: on_success
         - when: never