This makes it possible to build UAT with these references without having to run UBT first. Thus also fixes net core building of the project.
This adds about 5 seconds to the build time of automation tool but eliminates the need to run UBT and should avoid the need to implement -compile in UAT (in the end saving more then these 5 seconds)
This essentially does the same as UBT did before, create a .reference file on disk that can then be read by msbuild, it just does this in msbuild as well so we have fewer components involved.
#rb ben.marsh
[CL 14640899 by Joakim Lindqvist in ue5-main branch]
b4d3e129ca