feat(storagetransfer): update the API

#### storagetransfer:v1

The following keys were added:
- schemas.GcsData.properties.managedFolderTransferEnabled.description
- schemas.GcsData.properties.managedFolderTransferEnabled.type

discovery/storagetransfer-v1.json

@@ -632,7 +632,7 @@
       }
     }
   },
-  "revision": "20231214",
+  "revision": "20240126",
   "rootUrl": "https://storagetransfer.googleapis.com/",
   "schemas": {
     "AgentPool": {
@@ -936,6 +936,10 @@
           "description": "Required. Cloud Storage bucket name. Must meet [Bucket Name Requirements](/storage/docs/naming#requirements).",
           "type": "string"
         },
+        "managedFolderTransferEnabled": {
+          "description": "Transfer managed folders is in public preview. This option is only applicable to the Cloud Storage source bucket. If set to true: - The source managed folder will be transferred to the destination bucket - The destination managed folder will always be overwritten, other OVERWRITE options will not be supported",
+          "type": "boolean"
+        },
         "path": {
           "description": "Root path to transfer objects. Must be an empty string or full path name that ends with a '/'. This field is treated as an object prefix. As such, it should generally not begin with a '/'. The root path value must meet [Object Name Requirements](/storage/docs/naming#objectnames).",
           "type": "string"

src/apis/storagetransfer/v1.ts

@@ -343,6 +343,10 @@ export namespace storagetransfer_v1 {
      * Required. Cloud Storage bucket name. Must meet [Bucket Name Requirements](/storage/docs/naming#requirements).
      */
     bucketName?: string | null;
+    /**
+     * Transfer managed folders is in public preview. This option is only applicable to the Cloud Storage source bucket. If set to true: - The source managed folder will be transferred to the destination bucket - The destination managed folder will always be overwritten, other OVERWRITE options will not be supported
+     */
+    managedFolderTransferEnabled?: boolean | null;
     /**
      * Root path to transfer objects. Must be an empty string or full path name that ends with a '/'. This field is treated as an object prefix. As such, it should generally not begin with a '/'. The root path value must meet [Object Name Requirements](/storage/docs/naming#objectnames).
      */