Let utilities identify themselves as being part of uutils in --help and --version #12114

[Devel08]

This pr resolves #12114.
--version already contains "(uutils coreutils)", --help had uutils mentioned nowhere.

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/cut/bounded-memory (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/pr/bounded-memory (passes in this run but fails in the 'main' branch)

[Devel08]

Ready for review

[sylvestre]

i really don't like this change - lot of a duplication for a tiny gain

gnu has:

GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Report any translation bugs to <https://translationproject.org/team/>
Full documentation <https://www.gnu.org/software/coreutils/ls>
or available locally via: info '(coreutils) ls invocation'

at the end of the --help, maybe we should just replicate somethig like this

[Devel08]

@sylvestre doesn't every utility have its own --help though? Is there a way for that to be done in a single file? #7441 kind of does the same thing

[Devel08]

Anyways, if that is really not the way the project prefers, the PR can be closed