t7527: test Unicode NFC/NFD handling on MacOS

t7527: test Unicode NFC/NFD handling on MacOS

Confirm that the daemon reports events using the on-disk
spelling for Unicode NFC/NFD characters.  On APFS we still
have Unicode aliasing, so we cannot create two files that
only differ by NFC/NFD, but the on-disk format preserves
the spelling used to create the file.  On HFS+ we also
have aliasing, but the path is always stored on disk in
NFD.

Signed-off-by: Jeff Hostetler <redacted>
Signed-off-by: Junio C Hamano <redacted>