[ci] Improve pipeline-cancel job

.gitlab-ci.yml

@@ -127,6 +127,9 @@ test-linux-stable:
     # but still want to have debug assertions.
     RUSTFLAGS: "-Cdebug-assertions=y -Dwarnings"
   script:
+    # --------- remove me ------
+    - sleep 30; exit 1
+    # --------------------------
     - time cargo nextest run --all --release --locked --run-ignored all
 
 test-doc:
@@ -640,7 +643,7 @@ zombienet-0005-migrate_solo_to_para:
 # 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:
+cancel-pipeline:
   stage:                           .post
   needs:
     - job:                         test-linux-stable
@@ -656,3 +659,5 @@ zombienet-0005-migrate_solo_to_para:
     PR_NUM:                        "${PR_NUM}"
   trigger:
     project:                       "parity/infrastructure/ci_cd/pipeline-stopper"
+    # remove branch, when pipeline-stopper for substrate and polakdot is updated to the same branch
+    branch:                        "as-improve"