#26741: [desktop] Update the project python bootstrap to reset PATH

Make sure applications are launched with the proper DllDirectory set.
this is probably too much detail, but I am wondering if these method names are a bit misleading.

There doesn't seem to be a stack that is pushed and popped here - would it be more appropriate to call them `clear_dll_directory()` and `restore_dll_directory()` or something along those lines?