[ci] Adjust job order in pipeline test stage with Gitlab DAG (#11442)

* [Do Not Merge] Test gitlab DAG in pipeline

* add jobs for pipeline cancel

* add check-tracing to cancel-pipeline

substrate/.gitlab-ci.yml

@@ -201,3 +201,29 @@ deploy-prometheus-alerting-rules:
       changes:
         - .gitlab-ci.yml
         - ./scripts/ci/monitoring/**/*
+
+#### stage:                        .post
+
+# This job cancels the whole pipeline if any of provided jobs fail.
+# In a DAG, every jobs chain is executed independently of others. The `fail_fast` principle suggests
+# to fail the pipeline as soon as possible to shorten the feedback loop.
+cancel-pipeline:
+  stage:                           .post
+  needs:
+    - job:                         test-linux-stable
+      artifacts:                   false
+    - job:                         test-linux-stable-int
+      artifacts:                   false
+    - job:                         cargo-check-subkey
+      artifacts:                   false
+    - job:                         cargo-check-benches
+      artifacts:                   false
+    - job:                         check-tracing
+      artifacts:                   false
+  rules:
+    - if: $CI_COMMIT_REF_NAME =~ /^[0-9]+$/                         # PRs
+      when: on_failure
+  variables:
+    PROJECT_ID:                    "${CI_PROJECT_ID}"
+    PIPELINE_ID:                   "${CI_PIPELINE_ID}"
+  trigger:                         "parity/infrastructure/ci_cd/pipeline-stopper"