Add a header for reporting tests exit status

Co-authored-by: Olivier Halligon <olivier.halligon@automattic.com>

Author: tiagomar

.buildkite/commands/run-ui-tests.sh

@@ -35,4 +35,5 @@ set -e
 echo "--- 📦 Zipping test results"
 cd build/results/ && zip -rq WordPress.xcresult.zip WordPress.xcresult
 
-exit $TESTS_EXIT_STATUS
+echo "--- 🚦 Report Tests Exit Status
+exit $TESTS_EXIT_STATUS