ci: keep upstream watch outside PR validation topology

Author: niakw

.github/workflows/upstream-provider-watch.yml

@@ -4,14 +4,6 @@ on:
   schedule:
     - cron: "17 5 * * 1"
   workflow_dispatch:
-  pull_request:
-    branches: [main]
-    paths:
-      - ".github/workflows/upstream-provider-watch.yml"
-      - "engine_v2/config/provider-upstreams.json"
-      - "engine_v2/scripts/watch-upstream-providers.mjs"
-      - "engine_v2/tests/upstream-provider-watch.test.mjs"
-      - "provider_catalog.json"
 
 permissions:
   contents: read