tar: Move to the utilities package

[ivy]

Summary

tar(1) is not a core runtime utility; in particular, nothing in
/etc/rc.d/* requires it. Move it to utilities, which is also
where cpio(1) lives.

This removes the dependency from runtime to libarchive.

MFC after: 3 days

[emaste]

@manu moved tar to runtime in a7b5a3d48640f3f5898b05328d71c2949b6b7098 in 2019 with the message

pkgbase: Put a lot of binaries and lib in FreeBSD-runtime

All of them are needed to be able to boot to single user and be able
to repair a existing FreeBSD installation so put them directly into
FreeBSD-runtime.

but a lot has changed since then. I'd be surprised if there's a sensible recovery workflow that works with tar in runtime and not in utilities.

[manu]

I don't remember why I put it in -runtime back then