clippy: fix clippy::unnecessary_debug_formatting and clippy::io_other_error, adjusting cp tests to align with GNU #7941
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On my machine
cp a
returns the error messagecp: missing destination file operand after 'a'
. Prior to this PR, uutils double quoted thea
. This PR usesPath::display
instead ofDebug
output and quotes the file path withos_display
. I also fixed anio::Error
-related clippy warning inln
.