GH-127381: pathlib ABCs: remove remaining uncommon `PathBase` methods (#127714)

GH-127381: pathlib ABCs: remove remaining uncommon `PathBase` methods (#127714)

Remove the following methods from `pathlib._abc.PathBase`:

- `expanduser()`
- `hardlink_to()`
- `touch()`
- `chmod()`
- `lchmod()`
- `owner()`
- `group()`
- `from_uri()`
- `as_uri()`

These operations aren't regularly supported in virtual filesystems, so they
don't win a place in the `PathBase` interface. (Some of them probably don't
deserve a place in `Path` :P.) They're quasi-abstract (except `lchmod()`),
and they're not called by other `PathBase` methods.