fix: [compose-core] force output message to stderr

bin/compose-core

@@ -5612,7 +5612,7 @@ aexport remainder_args
 if [ -n "$DEBUG" ]; then
     Elt "compute hashes"
     start=$(time_now)
-fi
+fi >&2
 
 COMPOSE_YML_FILE=$(get_compose_yml_location) || exit 1
 COMPOSE_YML_CONTENT=$(get_compose_yml_content) || exit 1
@@ -5625,7 +5625,7 @@ if [ -n "$DEBUG" ]; then
     elapsed="$(time_elapsed $start "$(time_now)")" || exit 1
     print_info "$(printf "%.3fs" "$elapsed")"
     Feedback
-fi
+fi >&2
 
 charm.sanity_checks || die "Sanity checks about charm-store failed. Please correct."
 
@@ -5789,7 +5789,7 @@ if [ "$action" != "down" ]; then
     if [ -n "$DEBUG" ]; then
         Elt "get relation subset"
         start=$(time_now)
-    fi
+    fi >&2
 
     get_subset_relations "${services_args[@]}" >/dev/null || exit 1
 
@@ -5797,7 +5797,7 @@ if [ "$action" != "down" ]; then
         elapsed="$(time_elapsed $start "$(time_now)")" || exit 1
         print_info "$(printf "%.3fs" "$elapsed")"
         Feedback
-    fi
+    fi >&2
 fi
 if [ -n "$is_docker_compose_action" ] && [ "${#services_args[@]}" -gt 0 ]; then
     services=($(get_master_services "${services_args[@]}")) || exit 1