Use hosted pools for PR builds

[ChadNedzlek]

Public builds spend almost 30 minutes waiting for BuildPool machines to then do 2 minutes of building,
let's use the hosted pools

[missymessa]

LGTM

[MattGal]

If we keep doing this, we should perhaps remove the arcade buildpools from existence. There are so many things using the production providers now we don't need the test coverage at all.

Ironically, before runtime's build got too big, we needed this because hosted got backed up... :)

[ChadNedzlek]

I feel like random arcade PR's aren't the right way to test the pool provider anyway. :-)

[MattGal]

I feel like random arcade PR's aren't the right way to test the pool provider anyway. :-)

No I meant as something we're always depending on so we notice maybe before the users. Users tend to beat us anyway.

[ChadNedzlek]

My next PR is going to be to delete the bin directory after the build task. I really want this build to be fast enough that it's I don't have to go forget all about it and leave dangling PR's all over the place. :-)