Add Python test cases for documentation namespace in azure and unbranded#3301

msyyc wants to merge 5 commits intomainAzure/autorest.python:mainfrom

auto-microsoft-copilot/add-test-case-http-client-pythonAzure/autorest.python:auto-microsoft-copilot/add-test-case-http-client-pythonCopy head branch name to clipboard