MQ: Automate Azure Identity SDK Manual/Vendor Tests

[joshfree]

We should leverage @christothes 's work on https://github.com/Azure/azure-sdk-for-net/pull/33017/files to fully automate the list of manual/vendor test scenarios which are documented in the issues here: https://github.com/Azure/azure-sdk/issues?q=is%3Aopen+is%3Aissue+label%3AAzure.Identity

This includes:

• [ ] Automate Azure Arc testing
• [ ] Automate Azure Identity multi tenant testing
• [ ] Automate Azure Container Instances testing
  • See https://github.com/Azure/azure-sdk-for-go/pull/22652 for an example

~- [ ] Automate Azure Service Fabric testing~ - We don't have in C++

• All these use IMDS endpoints and can be combined (if needed):
• [ ] Automate Azure Functions testing
• [ ] Automate VM MSI testing
• [ ] Automate Azure WebJobs testing

~- [ ] Automate Pod Identity testing~ ~- [ ] Automate Cloudshell testing~

[antkmsft]

FWIW, we do have an "E2E" test for Managed Identity (https://github.com/Azure/azure-sdk-for-cpp/tree/b54d509c72fb76598832bcf1fcd5c4a89b245782/sdk/identity/azure-identity/test/e2e) - it is a tool - you/vendor build an exe/binary, and run it in the targeted environment, and the tool prints whether it was successful or not.