Do not run backend tests on unrelated changes (#23425)

* Do not run backend tests on unrelated changes

* Set explicit frontend test paths

Co-authored-by: flamber <1447303+flamber@users.noreply.github.com>

Co-authored-by: flamber <1447303+flamber@users.noreply.github.com>

.github/workflows/backend.yml

@@ -6,6 +6,11 @@ on:
       - 'master'
       - 'release-**'
   pull_request:
+    paths-ignore:
+      - "docs/**"
+      - "**.md"
+      - "frontend/test/**"
+      - "enterprise/frontend/test/**"
 
 jobs: