Add dotnetUp use command #51583
Description
dotnetup use should modify the current working terminal environment, such that the PATH points to the main local hive used by dotnetup to manage installs.
Similarly, dotnetup use <channel>, such as 'lts' or '9.0' should enable the path to point to a specific install, which may need to be a temporary / private folder copy, to enforce that this version is used.
Inspiration is ala nvm use