Retry reporting with fallback payloads (#11885)

Enhance post_update_to_api to support a "force" mode and robust retry logic: add a 3rd-arg bypass to duplicate suppression, capture a short error summary, and perform up to three POST attempts (full payload, shortened error payload, minimal payload) with HTTP code checks and small backoffs. Mark POST_UPDATE_DONE on success (or after three attempts) to avoid infinite retries. Also invoke post_update_to_api with the "force" flag from cleanup paths in build.func and error_handler.func so a final status update is attempted after cleanup.

misc/build.func

@@ -4130,6 +4130,10 @@ EOF'
       echo -e "${BFR}${CM}${GN}Container ${CTID} removed${CL}"
     fi
 
+    # Force one final status update attempt after cleanup
+    # This ensures status is updated even if the first attempt failed (e.g., HTTP 400)
+    post_update_to_api "failed" "$install_exit_code" "force"
+
     exit $install_exit_code
   fi
 }