Enforce WindowsDesktop DLL/EXE files having non-zero FileVersion

https://github.com/dotnet/core-setup/blob/851859e9e07eda7adb2dcf129b0d6fb3cab411e3/src/pkg/projects/windowsdesktop/dir.props#L8-L17

https://github.com/dotnet/core-setup/pull/5682 added validation that all DLL files in the platform manifest have a `FileVersion` that isn't null or 0.0.0.0. These WindowsDesktop files should be looked at so the validation suppression can be removed.

This is only a sanity check: there may be a valid reason, and this doesn't seem like a high priority.

First step is to identify where these files are created.

Start with src/pkg/projects/windowsdesktop/dir.props at lines 8–17 and review the validation added by core-setup#5682. Identify where the WindowsDesktop DLL and EXE files are created, then determine whether each has a non-zero FileVersion. Done means the suppression can be removed or a valid reason for it is documented.

Written by the indexing model from the issue text.