Add verbosity to wsl --unregister

**Is your feature request related to a problem? Please describe.**
wsl --unregister either goes instantly or hangs forever. some -v -vv erbosity would be nice

**Describe the solution you'd like**
verbosity flag(s) on wsl --unregister

Start at the wsl --unregister command entry point and inspect how it currently reports progress during completion or a hang. Define the intended verbosity levels and their observable output before assessing the implementation and test coverage. Done means the command provides useful, tested progress information at the requested verbosity.

Written by the indexing model from the issue text.