docs(samples): Removed Samples after Migration to Mono Repo

[holtskinner]

• Followup to migrate code from googleapis/python-documentai GoogleCloudPlatform/python-docs-samples#8862

[snippet-bot]

Here is the summary of changes.

You are about to delete 28 region tags.

• samples/snippets/batch_process_documents_processor_version_sample.py:16, tag documentai_batch_process_documents_processor_version
• samples/snippets/batch_process_documents_sample.py:16, tag documentai_batch_process_document
• samples/snippets/cancel_operation_sample.py:16, tag documentai_cancel_operation
• samples/snippets/create_processor_sample.py:16, tag documentai_create_processor
• samples/snippets/delete_processor_sample.py:16, tag documentai_delete_processor
• samples/snippets/delete_processor_version_sample.py:16, tag documentai_delete_processor_version
• samples/snippets/deploy_processor_version_sample.py:16, tag documentai_deploy_processor_version
• samples/snippets/disable_processor_sample.py:16, tag documentai_disable_processor
• samples/snippets/enable_processor_sample.py:16, tag documentai_enable_processor
• samples/snippets/fetch_processor_types_sample.py:16, tag documentai_fetch_processor_types
• samples/snippets/get_operation_sample.py:16, tag documentai_get_operation
• samples/snippets/get_processor_sample.py:16, tag documentai_get_processor
• samples/snippets/get_processor_version_sample.py:16, tag documentai_get_processor_version
• samples/snippets/list_operations_sample.py:16, tag documentai_list_operations
• samples/snippets/list_processor_versions_sample.py:16, tag documentai_list_processor_versions
• samples/snippets/list_processors_sample.py:16, tag documentai_list_processors
• samples/snippets/poll_operation_sample.py:16, tag documentai_poll_operation
• samples/snippets/process_document_form_sample.py:16, tag documentai_process_form_document
• samples/snippets/process_document_ocr_sample.py:16, tag documentai_process_ocr_document
• samples/snippets/process_document_processor_version_sample.py:16, tag documentai_process_document_processor_version
• samples/snippets/process_document_quality_sample.py:16, tag documentai_process_quality_document
• samples/snippets/process_document_sample.py:16, tag documentai_process_document
• samples/snippets/process_document_specialized_sample.py:16, tag documentai_process_specialized_document
• samples/snippets/process_document_splitter_sample.py:16, tag documentai_process_splitter_document
• samples/snippets/quickstart_sample.py:17, tag documentai_quickstart
• samples/snippets/review_document_sample.py:16, tag documentai_review_document
• samples/snippets/set_default_processor_version_sample.py:16, tag documentai_set_default_processor_version
• samples/snippets/undeploy_processor_version_sample.py:16, tag documentai_undeploy_processor_version

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