In .NET 5, we automatically converted an OutputType of Exe to WinExe for WPF and Windows forms apps. This was intended to simplify .NET MAUI apps (so that the OutputType wouldn't need to be conditioned on the TargetFramework).

However:

• This broke user expectations and frustrated some folks. See Revert DisableWinExeOutputInference #16563 and other linked issues
• .NET MAUI apps are going to by default use WinUI, not Windows Forms or WPF, so this logic won't even apply to them

So this PR reverts the previous automatic OutputType conversion.

@mattleibow @jonathanpeppers @Redth The .NET MAUI targets for Windows should probably do something similar to the logic being removed here, ie change the OutputType from Exe to WinExe when targeting Windows.