feat: add service_account to UploadModelRequest in aiplatform v1 mode…

…l_service.proto

PiperOrigin-RevId: 493943349

google/cloud/aiplatform/v1/model_service.proto

@@ -218,6 +218,15 @@ message UploadModelRequest {
 
   // Required. The Model to create.
   Model model = 2 [(google.api.field_behavior) = REQUIRED];
+
+  // Optional. The user-provided custom service account to use to do the model
+  // upload. If empty, [Vertex AI Service
+  // Agent](https://cloud.google.com/vertex-ai/docs/general/access-control#service-agents)
+  // will be used. Users uploading the Model must have the
+  // `iam.serviceAccounts.actAs` permission on this service account. Also, this
+  // account must belong to the project specified in the `parent` field and have
+  // all necessary read permissions.
+  string service_account = 6 [(google.api.field_behavior) = OPTIONAL];
 }
 
 // Details of [ModelService.UploadModel][google.cloud.aiplatform.v1.ModelService.UploadModel] operation.