Mixedrealitytoolkit-unity: "Integrate Oculus Integration Unity Modules" does not work with new packages

[hybridherbst]

Describe the bug

After following the package setup steps listed here: https://microsoft.github.io/MixedRealityToolkit-Unity/version/prerelease/2.5.0_stabilization/Documentation/usingupm.html

I was trying to follow the Quest setup from here: https://microsoft.github.io/MixedRealityToolkit-Unity/version/prerelease/2.5.0_stabilization/Documentation/CrossPlatform/OculusQuestMRTK.html

However, it seems since there is some asmdef magic going on there's an error when the MRTK is coming from a package (which are immutable in Unity):

Expected behavior

No error thrown, Quest setup works

Your setup (please complete the following information)

• Unity 2020.2.0b2
• MRTK Version 2.5.0-preview.20200922.2

Target platform (please complete the following information)

• Quest

Additional context

I think the right way to handle this is that the asmdefs already have the right reference to the correct GUID. It's not a problem if an asmdef has missing references as long as their existance is properly checked (e.g. through project scripting defines or version defines on the asmdef).

[keveleigh]

Related to #8574. We need to make sure this assembly is properly configured before packing

[hybridherbst]

I see.
Happy to do a PR to fix the Oculus side of things if you want.

[davidkline-ms]

Fixed by #8655