Print search location for patch when not found

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: EugenioCollado

scripts/apply_patches.sh

@@ -30,7 +30,7 @@ if [ ! -d "${WORKSPACE_DIR}" ]; then
 fi
 
 if [ -z "${PATCH_DIR}" ]; then
-    echo "Error: Patch directory '${PATCH_DIR}' does not exist"
+    echo "Error: Patch directory not found (searched: ${SCRIPT_DIR}/../../share/micro_ros_setup/patches, ${SCRIPT_DIR}/../share/micro_ros_setup/patches, ${SCRIPT_DIR}/../patches)"
     exit 255
 fi