feat(datamigration): update the api

#### datamigration:v1

The following keys were added:
- schemas.GoogleCloudClouddmsV1OperationMetadata.properties.metadata (Total Keys: 3)

Author: yoshi-automation

googleapiclient/discovery_cache/documents/datamigration.v1.json

@@ -2340,7 +2340,7 @@
 }
 }
 },
-"revision": "20250519",
+"revision": "20250521",
 "rootUrl": "https://datamigration.googleapis.com/",
 "schemas": {
 "AlloyDbConnectionProfile": {
@@ -4214,6 +4214,14 @@
 "readOnly": true,
 "type": "string"
 },
+"metadata": {
+"additionalProperties": {
+"type": "string"
+},
+"description": "Output only. Additional metadata that is returned by the backend for the operation.",
+"readOnly": true,
+"type": "object"
+},
 "requestedCancellation": {
 "description": "Output only. Identifies whether the user has requested cancellation of the operation. Operations that have successfully been cancelled have google.longrunning.Operation.error value with a google.rpc.Status.code of 1, corresponding to `Code.CANCELLED`.",
 "readOnly": true,