This issue is a fork of #70027 for platform-mac. #70027. Build tests for platform-mac should mirror platform-windows as closely as possible.

• [macOS] Bring up compilation devicelab tests (x86) #109799
• [macOS] Bring up startup devicelab tests #109800

Description

The initial desktop integration tests are running now, but they need to be expanded beyond the initial gallery build test; filing this to make sure that planned work is captured in the issue tracker. This should be much more straightforward that getting the first one running was, since the bot work is all complete.

In particular we should ensure we are testing building a freshly created project to catch errors in template changes. (I haven't checked where that test lives on existing platforms; it may be a device lab test, which still needs desktop bring-up).