Lennart Poettering fa41ce1142 hostnamed: after unescaping fancy name, validate it's valid UTF-8
The fancy name could contain arbitrary bytes, in escaped fashion. Before
using it, let's validate that this contains only valid UTF-8.

(Note that D-Bus might kick us off the bus if we don't ensure everything
we send around is UTF-8).

(While we are at it, do the same in PID 1, even though it's not that
important there)

Addresses this issue found by @YHNdnzj:

https://github.com/systemd/systemd/pull/40367#discussion_r2714614301

Follow-up for: #40367
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