[Helix] Reenable ProjectTemplatesTests

[HaoK]

ProjectTemplates are currently disabled entirely on helix

[HaoK]

@danroth27 most of the test projects are pretty simple to convert to helix. I don't think ProjectTemplates tests are one of them, similar to IIS tests, this one is going to need someone who knows these tests well to get them working on helix. I opened the draft PR as a starting point to help that process.

[danroth27]

@HaoK Got it - makes sense.
@mkArtakMSFT Can we get this assigned to someone? What milestone makes sense to address this?