Use .nvmrc for determining the node image used for E2E tests (#24446)

* Use .nvmrc for determining the node image used for E2E tests

* Rename E2E rundir from /app to /cypress for consistency

server/scripts/mirror-docker-images.json

@@ -37,6 +37,8 @@
   "node": {
     "16.10.0": "node:16.10.0",
     "16.17.0": "node:16.17.0",
+    "18": "node:18@sha256:11e9c297fc51f6f65f7d0c7c8a8581e5721f2f16de43ceff1a199fd3ef609f95",
+    "18.17": "node:18.17@sha256:11e9c297fc51f6f65f7d0c7c8a8581e5721f2f16de43ceff1a199fd3ef609f95",
     "18.17.1": "node:18.17.1@sha256:11e9c297fc51f6f65f7d0c7c8a8581e5721f2f16de43ceff1a199fd3ef609f95"
   }
 }