coreutils mv: gnu test case mv-n compatibility

fix for #6598

Behviours changed:

`-n' would now silently fail to copy a file when the destination already exists
added --update=none-fail to cp and mv
arg parser would show a suggestion if parsing failed because of ambiguous value

Jul 28 '24 18:07 matrixhead

GNU testsuite comparison:

Congrats! The gnu test tests/mv/mv-n is no longer failing!

Jul 28 '24 18:07 github-actions[bot]

GNU testsuite comparison:

Skip an intermittent issue tests/tail/inotify-dir-recreate (fails in this run but passes in the 'main' branch)
Congrats! The gnu test tests/mv/mv-n is no longer failing!

Jul 28 '24 19:07 github-actions[bot]

GNU testsuite comparison:

Congrats! The gnu test tests/mv/mv-n is no longer failing!

Aug 02 '24 12:08 github-actions[bot]

GNU testsuite comparison:

Congrats! The gnu test tests/mv/mv-n is no longer failing!

Aug 15 '24 08:08 github-actions[bot]

changes in new commits

added --debug support for mv
cp would fail silently when -n is given, only prints a log when --debug is given

Aug 16 '24 08:08 matrixhead

GNU testsuite comparison:

Congrats! The gnu test tests/mv/mv-n is no longer failing!
Congrats! The gnu test tests/mv/update is no longer failing!

Aug 16 '24 08:08 github-actions[bot]

GNU testsuite comparison:

Congrats! The gnu test tests/mv/mv-n is no longer failing!
Congrats! The gnu test tests/mv/update is no longer failing!

Aug 16 '24 09:08 github-actions[bot]

well done and sorry for the latency

Sep 14 '24 07:09 sylvestre