fix js oom `js-scripts` (#6139)

Fix `oom` failures (`FATAL ERROR: Ineffective mark-compacts near heap
limit Allocation failed - JavaScript heap out of memory`), like:

https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/7602589
https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/7602594

---------

Co-authored-by: Bastian Köcher <git@kchr.de>

.gitlab/pipeline/zombienet.yml

@@ -9,6 +9,7 @@
     RUN_IN_CI: "1"
     KUBERNETES_CPU_REQUEST: "512m"
     KUBERNETES_MEMORY_REQUEST: "1Gi"
+    NODE_OPTIONS: "--max-old-space-size=8192"
   timeout: 60m
 
 include:

.gitlab/pipeline/zombienet/bridges.yml

@@ -47,6 +47,8 @@
     - cp -r /tmp/bridges-tests-run-*/bridge_hub_rococo_local_network/*.log ./zombienet-logs/
     # copy logs of westend nodes
     - cp -r /tmp/bridges-tests-run-*/bridge_hub_westend_local_network/*.log ./zombienet-logs/
+  tags:
+    - zombienet-polkadot-integration-test
 
 zombienet-bridges-0001-asset-transfer-works:
   extends: