wsl --uninstall should warn users it's **not** for removing distribution. #13979

Is your feature request related to a problem? Please describe.
wsl --install Distro is the command-line option to install distribution. So that means user expects wsl --uninstall Distro is the command-line to uninstall distribution.

Unfortunately, it's not. wsl --uninstall regardless if you add the distribution name or not, removes the whole WSL installation. Removing distribution is wsl --unregister Distro instead. I think this is bit confusing.

Describe the solution you'd like
I can think of 2 solutions:

1. Make wsl --uninstall warn user of removing WSL entirely instead of removing distribution. Add -y to force-confirm.
2. Make wsl --uninstall Distro an alias to wsl --unregister Distro.

Both solution is not mutually exclusive, so either one of them or both can be implemented.

Describe alternatives you've considered
The alternative is to read the command-line options.

Additional context
From user perspective, it makes sense to think like this:

1. Installing distribution in WSL is wsl --install Distro
2. So, the opposite of --install is --uninstall.
3. That means wsl --uninstall Distro should be the command to uninstall a distribution.

Fotunately no data loss is observed when running wsl --uninstall followed by wsl --install Distro. At least, the existing distribution is still there.