Include Compiler features in Project Engine

[ryanbrandenburg]

Summary of the changes

• As per @333fred and my investigations it seems that we weren't registering the CompilerFeatures in the non-legacy factory.
• Also added an Integration test for this scenario. Partially to confirm this is fixed, but also as a hedge against reoccurrence since we were unable to determine a root cause for the sudden behavior change (IE: How did this ever work?).

Fixes: #7966

[davidwengier]

I would love to know what changed, and why, to cause this to be picked up, but I think this is objectively the right fix regardless of the outcome of that investigation.

[allisonchou]

@333fred @ryanbrandenburg I implemented the same fix in the VSCode branch a few weeks ago - #8061

Seeing merge conflicts now between the feature branch and main. I'm going to take the feature branch version if that's OK with you two.

[allisonchou]

Actually, after talking to Ryan separately, it sounds like maybe the main branch fix is the right one to pick since it's the one going through QB. Will edit the feature branch code.