Before, iteration would stop whenever an installation with vcruntime.lib was found, but that may not be the most recent installed version. Instead, we now iterate all installed instances and choose the one with the newest version.
The C++ version of this code used this logic, and it turns out it is able to find some setups that the current registry/Vs7 methods cannot.
For example, if only the "Build Tools for Visual Studio" are installed but not Visual Studio itself, then only the ISetupEnumInstances method seems to find it.
Follow up to #15657, fixes a regression caused by moving from the C++ version to the Zig version
