Define CI triggers for frontend tests (#34944)

.github/file-paths.yaml

@@ -12,6 +12,11 @@ shared_sources: &shared_sources
 shared_specs: &shared_specs
   - "shared/test/**"
 
+frontend_ci: &frontend_ci
+  - ".github/actions/prepare-frontend/**"
+  - ".github/actions/prepare-backend/**"
+  - ".github/workflows/frontend.yml"
+
 frontend_sources: &frontend_sources
   - *shared_sources
   - "enterprise/frontend/!(test)**/**/{!(*.spec),}.{js,jsx,ts,tsx,css}"
@@ -33,7 +38,7 @@ frontend_specs: &frontend_specs
   - "jest.tz.unit.conf.json"
 
 frontend_all: &frontend_all
-  - *ci
+  - *frontend_ci
   - *frontend_sources
   - *frontend_specs