feat: [google-cloud-documentai] Removed deprecated api versions

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PiperOrigin-RevId: 681956159

Source-Link: https://github.com/googleapis/googleapis/commit/ff4436beeb10715bedeb54da24f87a3b4dcddcea

Source-Link: https://github.com/googleapis/googleapis-gen/commit/1b41353956190b52884e5bcc7eceda2b9a92f756 Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWNsb3VkLWRvY3VtZW50YWkvLk93bEJvdC55YW1sIiwiaCI6IjFiNDEzNTM5NTYxOTBiNTI4ODRlNWJjYzdlY2VkYTJiOWE5MmY3NTYifQ==

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Here is the summary of changes.

You are about to delete 4 region tags.

• packages/google-cloud-documentai/samples/generated_samples/documentai_v1beta2_generated_document_understanding_service_batch_process_documents_async.py:26, tag documentai_v1beta2_generated_DocumentUnderstandingService_BatchProcessDocuments_async
• packages/google-cloud-documentai/samples/generated_samples/documentai_v1beta2_generated_document_understanding_service_batch_process_documents_sync.py:26, tag documentai_v1beta2_generated_DocumentUnderstandingService_BatchProcessDocuments_sync
• packages/google-cloud-documentai/samples/generated_samples/documentai_v1beta2_generated_document_understanding_service_process_document_async.py:26, tag documentai_v1beta2_generated_DocumentUnderstandingService_ProcessDocument_async
• packages/google-cloud-documentai/samples/generated_samples/documentai_v1beta2_generated_document_understanding_service_process_document_sync.py:26, tag documentai_v1beta2_generated_DocumentUnderstandingService_ProcessDocument_sync

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