[Test Resources] Add Environment Variables (#822)
[Test Resources] Add Environment Variables (#822)

The focus of these changes is to include additional environment variables
in the TestEnvironment to allow for cross-cloud management plane operations,
such as those used by the Azure Messaging client libraries.
tg-msft/azure-sdk-tools,tg-msft/azure-sdk-tools,tg-msft/azure-sdk-tools,tg-msft/azure-sdk-tools,tg-msft/azure-sdk-tools,tg-msft/azure-sdk-tools,tg-msft/azure-sdk-tools,tg-msft/azure-sdk-tools