Add support for MSVC "Visual Studio 2022 Preview channel"

[MisterDA]

Microsoft regularly publishes beta "preview" versions of MSVC, expanding the features covered in C and C++ languages, and sometimes changing the behavior of the command-line tool cl.exe. I'm using this preview release to test for bugs and missing features of the compiler, in order not have to report already fixed bugs, and be up-to-date w.r.t. new behaviors of the compiler. It would be quite useful to have access to the preview channel of MSVC in godbolt.org!
I don't know how the infrastructure's set up, but a first step could be to switch the install channel to Visual Studio 2022 Preview channel using Visual Studio Installer --channelUri or --channelId to (respectively) https://aka.ms/vs/17/pre/channel and VisualStudio.17.Preview.
This would also bring the support on par with other compilers, for which the trunk branch is already available in godbolt.
Thanks for the hard work!