Use server logging on source build job (#50827)
Use server logging on source build job (#50827)

This enables the compiler server logging whenever binary logging is
enabled on our Unix builds. This is sensible given that the binary log
at the moment doesn't contain all of the information we need to
investigate build failures (actively trying to fix that). Need these
logs so we can figure out what is going wrong with our source build jobs
AmadeusW/roslyn,KevinRansom/roslyn,AlekseyTs/roslyn,shyamnamboodiripad/roslyn,KevinRansom/roslyn,weltkante/roslyn,sharwell/roslyn,physhi/roslyn,tmat/roslyn,AlekseyTs/roslyn,weltkante/roslyn,KevinRansom/roslyn,shyamnamboodiripad/roslyn,wvdd007/roslyn,wvdd007/roslyn,bartdesmet/roslyn,jasonmalinowski/roslyn,diryboy/roslyn,CyrusNajmabadi/roslyn,dotnet/roslyn,physhi/roslyn,AmadeusW/roslyn,tmat/roslyn,sharwell/roslyn,ErikSchierboom/roslyn,physhi/roslyn,mavasani/roslyn,mgoertz-msft/roslyn,dotnet/roslyn,CyrusNajmabadi/roslyn,mavasani/roslyn,shyamnamboodiripad/roslyn,CyrusNajmabadi/roslyn,bartdesmet/roslyn,ErikSchierboom/roslyn,mgoertz-msft/roslyn,eriawan/roslyn,diryboy/roslyn,jasonmalinowski/roslyn,dotnet/roslyn,bartdesmet/roslyn,sharwell/roslyn,eriawan/roslyn,mgoertz-msft/roslyn,ErikSchierboom/roslyn,AlekseyTs/roslyn,diryboy/roslyn,weltkante/roslyn,eriawan/roslyn,wvdd007/roslyn,AmadeusW/roslyn,mavasani/roslyn,tmat/roslyn,jasonmalinowski/roslyn