ci: Elaborate causes for job retries

Rather than always retrying, only retry jobs on a limited set of causes.
This notably excludes retries when a job is stuck due to lack of runners
to schedule it; if we can't get a slot on a runner in time, there's no
reason to try again, since our window of opportunity has gone.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23108>

.gitlab-ci.yml

@@ -60,6 +60,16 @@ default:
   # https://gitlab.freedesktop.org/mesa/mesa/-/issues/?sort=created_date&state=opened&label_name%5B%5D=CI%20daily
   retry:
     max: 1
+    # Ignore runner_unsupported, stale_schedule, archived_failure, or
+    # unmet_prerequisites
+    when:
+      - api_failure
+      - runner_system_failure
+      - script_failure
+      - job_execution_timeout
+      - scheduler_failure
+      - data_integrity_failure
+      - unknown_failure
 
 include:
   - project: 'freedesktop/ci-templates'