fix(ci): prevent grep exit code 1 from failing empty dir check

- Add || true to grep -v that filters empty lines from VALID_PATHS
- GitHub Actions bash uses set -eo pipefail, so grep returning 1 (no
  matches) killed the script before reaching the graceful exit 0

.github/workflows/ui-e2e-tests-v2.yml

@@ -242,7 +242,7 @@ jobs:
                 echo "Skipping empty test directory: $p"
               fi
             done <<< "$TEST_PATHS"
-            VALID_PATHS=$(echo "$VALID_PATHS" | grep -v '^$')
+            VALID_PATHS=$(echo "$VALID_PATHS" | grep -v '^$' || true)
             if [[ -z "$VALID_PATHS" ]]; then
               echo "No test files found in any resolved paths — skipping E2E"
               exit 0