docs(samples): Document AI - Added Test & Evaluation Samples for v1beta3 2.3.0

[holtskinner]

• Replacement for docs(samples): Added Test & Evaluation Samples for v1beta3 2.3.0 googleapis/python-documentai#417

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• Please merge this PR for me once it is approved.

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• documentai/snippets/evaluate_processor_version_sample.py:16, tag documentai_evaluate_processor_version
• documentai/snippets/get_evaluation_sample.py:16, tag documentai_get_evaluation
• documentai/snippets/list_evaluations_sample.py:16, tag documentai_list_evaluations
• documentai/snippets/train_processor_version_sample.py:16, tag documentai_train_processor_version

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[parthea]

Please resolve the lint failure in Kokoro CI - Lint
https://source.cloud.google.com/results/invocations/40f02f1c-e15e-42d2-a7d0-81e8bc7914f1/log

nox > Running session lint
nox > Creating virtual environment (virtualenv) using python3.7 in .nox/lint
nox > python -m pip install flake8 flake8-import-order
nox > flake8 --show-source --builtin=gettext --max-complexity=20 --import-order-style=google '--exclude=.nox,.cache,env,lib,generated_pb2,*_pb2.py,*_pb2_grpc.py' --ignore=ANN101,E121,E123,E126,E203,E226,E24,E266,E501,E704,W503,W504,I202 --max-line-length=88 --application-import-names process_document_processor_version_sample_test,delete_processor_version_sample_test,batch_process_documents_processor_version_sample_test,batch_process_documents_processor_version_sample,process_document_ocr_sample,set_default_processor_version_sample_test,cancel_operation_sample,process_document_splitter_sample_test,undeploy_processor_version_sample,evaluate_processor_version_sample_test,batch_process_documents_sample_test,enable_processor_sample_test,noxfile,resources,fetch_processor_types_sample_test,cancel_operation_sample_test,list_processor_versions_sample_test,delete_processor_version_sample,get_processor_sample_test,disable_processor_sample_test,delete_processor_sample,process_document_processor_version_sample,quickstart_sample,review_document_sample,list_processor_versions_sample,process_document_quality_sample,evaluate_processor_version_sample,disable_processor_sample,get_processor_version_sample,process_document_form_sample_test,set_default_processor_version_sample,poll_operation_sample_test,list_processors_sample,get_evaluation_sample_test,undeploy_processor_version_sample_test,get_processor_version_sample_test,train_processor_version_sample_test,noxfile_config,review_document_sample_test,get_operation_sample_test,process_document_form_sample,process_document_sample,process_document_specialized_sample_test,create_processor_sample,list_evaluations_sample,train_processor_version_sample,list_processors_sample_test,get_processor_sample,get_operation_sample,process_document_ocr_sample_test,__init__,process_document_splitter_sample,delete_processor_sample_test,enable_processor_sample,fetch_processor_types_sample,create_processor_sample_test,batch_process_documents_sample,get_evaluation_sample,process_document_quality_sample_test,list_operations_sample,quickstart_sample_test,list_evaluations_sample_test,process_document_specialized_sample,poll_operation_sample,.nox,list_operations_sample_test,deploy_processor_version_sample_test,process_document_sample_test,deploy_processor_version_sample .
./evaluate_processor_version_sample_test.py:19:1: I100 Import statements are in the wrong order. 'from documentai.snippets import evaluate_processor_version_sample' should be before 'import mock'
from documentai.snippets import evaluate_processor_version_sample
^
./get_evaluation_sample_test.py:19:1: I100 Import statements are in the wrong order. 'from documentai.snippets import get_evaluation_sample' should be before 'import mock'
from documentai.snippets import get_evaluation_sample
^
./train_processor_version_sample_test.py:19:1: I100 Import statements are in the wrong order. 'from documentai.snippets import train_processor_version_sample' should be before 'import mock'
from documentai.snippets import train_processor_version_sample
^
nox > Command flake8 --show-source --builtin=gettext --max-complexity=20 --import-order-style=google '--exclude=.nox,.cache,env,lib,generated_pb2,*_pb2.py,*_pb2_grpc.py' --ignore=ANN101,E121,E123,E126,E203,E226,E24,E266,E501,E704,W503,W504,I202 --max-line-length=88 --application-import-names process_document_processor_version_sample_test,delete_processor_version_sample_test,batch_process_documents_processor_version_sample_test,batch_process_documents_processor_version_sample,process_document_ocr_sample,set_default_processor_version_sample_test,cancel_operation_sample,process_document_splitter_sample_test,undeploy_processor_version_sample,evaluate_processor_version_sample_test,batch_process_documents_sample_test,enable_processor_sample_test,noxfile,resources,fetch_processor_types_sample_test,cancel_operation_sample_test,list_processor_versions_sample_test,delete_processor_version_sample,get_processor_sample_test,disable_processor_sample_test,delete_processor_sample,process_document_processor_version_sample,quickstart_sample,review_document_sample,list_processor_versions_sample,process_document_quality_sample,evaluate_processor_version_sample,disable_processor_sample,get_processor_version_sample,process_document_form_sample_test,set_default_processor_version_sample,poll_operation_sample_test,list_processors_sample,get_evaluation_sample_test,undeploy_processor_version_sample_test,get_processor_version_sample_test,train_processor_version_sample_test,noxfile_config,review_document_sample_test,get_operation_sample_test,process_document_form_sample,process_document_sample,process_document_specialized_sample_test,create_processor_sample,list_evaluations_sample,train_processor_version_sample,list_processors_sample_test,get_processor_sample,get_operation_sample,process_document_ocr_sample_test,__init__,process_document_splitter_sample,delete_processor_sample_test,enable_processor_sample,fetch_processor_types_sample,create_processor_sample_test,batch_process_documents_sample,get_evaluation_sample,process_document_quality_sample_test,list_operations_sample,quickstart_sample_test,list_evaluations_sample_test,process_document_specialized_sample,poll_operation_sample,.nox,list_operations_sample_test,deploy_processor_version_sample_test,process_document_sample_test,deploy_processor_version_sample . failed with exit code 1
nox > Session lint failed.
PWD: /workspace/documentai/snippets

 Testing failed: Nox returned a non-zero exit code.