[Cosmos] run cosmos emulator tests during PRs

[analogrelay]

This PR adds some logic to the azure_data_cosmos CI pipeline to run tests against the Cosmos emulator. This is largely based on similar logic in the Go SDK.

To implement this, I added an AdditionalStages parameter to archetype-sdk-client.yml, again mirroring what I saw in the Go SDK, which places the steps after the default pack/test/analyzer steps but BEFORE any release steps.

We install the Windows emulator primarily because that's the logic that already exists in eng/common. There is a Linux emulator, that runs as a Docker image, but I wanted to be consistent here.

In addition, I tweaked recording::start to activate tracing even when test proxy wasn't in use. This allows us to use RUST_LOG to turn tracing on for live tests.

[analogrelay]

I see now that the PR builds aren't quite structured the same. I'm looking in to an approach using the Test-Setup.ps1 file

[heaths]

I see now that the PR builds aren't quite structured the same. I'm looking in to an approach using the Test-Setup.ps1 file

Work with @hallipr and @LarryOsterman if needed. They devised that system.