bug#63648: 29.0.90; project.el: with switch-use-entire-map, switch-project errors on non-project commands

[Juri Linkov]

> How about this, then?
>
> project-switch-use-global-map is obsoleted, all variations are accessible
> through customizing project-switch-commands. Should have better
> discoverability for project-prefix-or-any-command than simply having it
> included.

I don't know, it's extra trouble for users to migrate
from the obsoleted project-switch-use-entire-map.
But maybe ok.

> I don't like having a prompt that requires prior knowledge to use, but fair
> enough, let's just use [executing in ...] for now. Perhaps someone will
> suggest an alternative later.
>
> The new revision is attached, have a look.

Thanks, tried, it works nicely.

One minor question is why project-prefix-or-any-command
is a command.  Would anyone want to bind it in project-prefix-map,
like project-any-command that makes sense to run commands in root.