[Build] Create 2nd Stage/Job for Smoke Tests

[michael-hawker]

I also thought we had discussed before, but could we split the smoke test part into a 2nd job/stage? That'd make the build report and publish to the PR feed as a separate check from the smoke test itself which could run after, eh?

Basically showing up as a third line, so in this last case, we'd have seen the build and the release to our feed succeed, but then the smoke test line (not here) fail?

Originally posted by @michael-hawker in #3450 (comment)

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[michael-hawker]

All the work for the smoke tests are done, this should just be some YAML configuration for splitting the step out into it's own stage or something to get it to appear as a new line item after the build.

[michael-hawker]

Also see for reference what PowerToys is planning to adopt from Terminal: microsoft/PowerToys#7162 (Edit: ah misunderstood this is for releases not pipelines, so probably not useful as we have a simpler release pipe.)