fix: make multipart discovery and cancellation explicit and bounded

Signed-off-by: Feng Ruohang <rh@vonng.com>

buildscripts/rebrand-guard/compat-baseline.json

@@ -134,6 +134,7 @@
     "MINIO_API_GZIP_OBJECTS",
     "MINIO_API_LEGACY_BUCKET_RESOURCE_MATCH",
     "MINIO_API_LIST_QUORUM",
+    "MINIO_API_MULTIPART_LISTING",
     "MINIO_API_OBJECT_MAX_VERSIONS",
     "MINIO_API_ODIRECT",
     "MINIO_API_REMOTE_TRANSPORT_DEADLINE",
@@ -766,6 +767,7 @@
     "/metrics/v3",
     "/minio/grid/",
     "/minio/grid/lock/",
+    "/multipart-preflight",
     "/netperf",
     "/notification",
     "/oauth2/callback",