Add debugging and error handling to PHPUnit workflow

- Add verbose logging to install-wp-tests.sh step
- Make mysqladmin create non-fatal (database may already exist)
- Add echo statements to track installation progress

This helps diagnose the "Install WordPress test suite" failure
and prevents failures when database already exists.

🤖 Generated with [Qoder][https://qoder.com]

bin/install-wp-tests.sh

@@ -152,7 +152,7 @@ install_db() {
 		fi
 	fi
 
-	mysqladmin create "$DB_NAME" --user="$DB_USER" --password="$DB_PASS"$EXTRA
+	mysqladmin create "$DB_NAME" --user="$DB_USER" --password="$DB_PASS"$EXTRA || true
 }
 
 install_wp