add dependency update step to helm-install-test job

- Ensure Helm chart dependencies are built before helm-install
- Fixes missing charts/ directory error in cert-manager dependency
- Prevents 'helm dependency build' requirement errors
- Dependencies now properly resolved for helmfile sync execution

Author: adamancini

.github/workflows/wg-easy-pr-validation.yaml

@@ -248,6 +248,9 @@ jobs:
           helm-version: ${{ env.HELM_VERSION }}
           install-helmfile: 'true'
 
+      - name: Update dependencies
+        run: task dependencies-update
+
       - name: Helm registry login
         if: needs.create-customer-and-cluster.outputs.skip-customer-registry == 'false'
         run: |