* [vcpkg] Implement --x-write-nuget-packages-config= setting for `install` and `x-set-installed`.
* [vcpkg] Add end-to-end testing suite for install, remove, and binary caching
* [vcpkg] Define `$TestingRoot in end-to-end-tests.ps1
* [vcpkg] Address CR comments
Co-authored-by: Robert Schumacher <roschuma@microsoft.com>