fix(submit): 上传途中投稿被撤回或删除时，由上传自己删掉刚落地的 blob

docs/openapi.yaml

@@ -5858,7 +5858,9 @@ paths:
         location Kaniko reads via --context. The submitter is taken from the
         principal; a submission the caller does not own is reported as 404, so
         this endpoint cannot upload to or probe another user's submission. Only a
-        pending_review submission accepts a context (409 otherwise); a wrong-format
+        pending_review submission accepts a context (409 otherwise), and one
+        withdrawn or deleted while its context streams in answers 404 with the
+        bytes discarded; a wrong-format
         or oversize body is rejected with 400 (the per-upload cap is [registry]
         context_max_bytes, 1 GiB by default; GET /api/v1/me/submissions/limits
         reports it so a client can check a file before sending it). This