[vcpkg upgrade] add --clean-after-build option to vcpkg upgrade

[Be-ing]

Is your feature request related to a problem? Please describe.
--clean-after-build prevents a build of many packages from taking up too much storage space for vcpkg install. vcpkg upgrade may encounter this problem too.

Proposed solution
Implement --clean-after-build for vcpkg upgrade

Describe alternatives you've considered
🤷

Additional context
CI services have finite storage space available.

[JackBoosY]

Should wait for us to fix the upgrade command fist.

[SHIHUAMarryMe]

I also need this. there are so many *.tar.gz files in "downloads".