chore: follow logging pattern from heroku for phase command declarations

plugins/app-json/internal-functions

@@ -47,7 +47,7 @@ execute_script() {
     return
   fi
 
-  dokku_log_info1 "Running '$SCRIPT_CMD' in app container"
+  dokku_log_exclaim "${PHASE_SCRIPT_KEY^} command declared: '$SCRIPT_CMD'"
   local COMMAND
   COMMAND="set -eo pipefail; [[ \$DOKKU_TRACE ]] && set -x ; "
   COMMAND+=" if [[ -d '/app' ]]; then "