Remove some unneeded promises #1940
                
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I've remade this PR by cherry-picking and squashing the commits from the original onto the latest develop branch.
Tests on my fork look fine. Locally, tests succeed except for the install logic ones (I suspect there's an issue with the paths but not sure what), and running it locally with a mock profile seems to work fine.
Of note: There are still several
new PromiseandPromise.resolveand.thenbits in the code. It's very likely that most of those can be changed to use await, but I'd rather leave them to someone else for now.