test: run integration tests against pull requests against dev/v3

Author: karenc-bq

.github/workflows/integration_tests.yml

@@ -5,7 +5,6 @@ on:
   push:
     branches:
       - main
-      - dev/v3
     paths-ignore:
       - "**/*.md"
       - "**/*.jpg"
@@ -14,6 +13,9 @@ on:
       - "docs/**"
       - "ISSUE_TEMPLATE/**"
       - "**/remove-old-artifacts.yml"
+  pull_request:
+    branches:
+      - dev/v3
 
 permissions:
   id-token: write   # This is required for requesting the JWT