sort: Handle non-utf8 sorting content

[RenjiSann]

Fixes

• sort should support invalid utf8 in the C locale #4049

This MR changes the type used to represent content from &str to &[u8], allowing for non-UTF-8 text to be processed.
Additionally, it makes behavior changes to 100% match GNU LC_ALL=C behavior, preparing the ground for latter localization support.

Notable changes:

• Multiple fixture files: Blessed the debug output that was incorrect for the LC_ALL=C locale.
• test_util_name.rs: Ignore 2 tests that assumed sort coudn't process invalid UTF-8 to check the binary name.
• uucore::version_cmp: API change to handle &[u8] instead of &str.
• ls.rs: Consequences of the changes in version_cmp.

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/misc/tee (passes in this run but fails in the 'main' branch)
Congrats! The gnu test tests/df/problematic-chars is no longer failing!

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/timeout/timeout (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/misc/tee (passes in this run but fails in the 'main' branch)

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/misc/stdbuf (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/timeout/timeout (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/misc/tee (passes in this run but fails in the 'main' branch)

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/misc/stdbuf (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/timeout/timeout (passes in this run but fails in the 'main' branch)

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/misc/tee (passes in this run but fails in the 'main' branch)

[cakebaker]

Good work :)