feat: [documentai] Add a field for upgrading previous processor version when fine tuning (#7607)

* feat: Add a field for upgrading previous processor version when fine tuning

PiperOrigin-RevId: 882129422

Source-Link: googleapis/googleapis@bce678d

Source-Link: googleapis/googleapis-gen@25b540b
Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWNsb3VkLWRvY3VtZW50YWkvLk93bEJvdC55YW1sIiwiaCI6IjI1YjU0MGIxMjJiNjlmZThhODJlODgwNWVjYWIyN2E4Y2JiNDY3YmEifQ==

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Santiago Quiroga <22756465+quirogas@users.noreply.github.com>

Author: gcf-owl-bot[bot]

packages/google-cloud-documentai/protos/google/cloud/documentai/v1beta3/document_processor_service.proto

@@ -1118,6 +1118,14 @@ message TrainProcessorVersionRequest {
     // values are between 0.1 and 10. If not provided, recommended learning rate
     // will be used.
     float learning_rate_multiplier = 3 [(google.api.field_behavior) = OPTIONAL];
+
+    // Optional. Resource name of a previously fine tuned version id to copy the
+    // overwritten configs from. The base_processor_version should be newer than
+    // the base processor version used to fine tune this provided processor
+    // version. Format:
+    // `projects/{project}/locations/{location}/processors/{processor}/processorVersions/{processorVersion}`.
+    string previous_fine_tuned_processor_version_name = 5
+        [(google.api.field_behavior) = OPTIONAL];
   }
 
   oneof processor_flags {