s3: Force a prefix removal using a special header (#12504)

An S3 client can send `x-minio-force-delete: true` to remove a prefix.

cmd/object-api-interface.go

@@ -58,6 +58,8 @@ type ObjectOptions struct {
 	ProxyHeaderSet bool                                                  // only set for GET/HEAD in active-active replication scenario
 	ParentIsObject func(ctx context.Context, bucket, parent string) bool // Used to verify if parent is an object.
 
+	DeletePrefix bool //  set true to enforce a prefix deletion, only application for DeleteObject API,
+
 	// Use the maximum parity (N/2), used when saving server configuration files
 	MaxParity bool
 }