Add user (as well as machine) .msis for all flavors

[stuartpa]

winget supports user and machine installers, we might as well implement the full complement. But for usability we should only do this if we can ensure "machine" is the default, or at least the default when we can detect ODBC sqlcmd is already in the path.

We probably shouldn't do this if we machine isn't the winget default AND we can't tell winget to do machine if we can detect ODBC sqlcmd is already in the path.