rgw: [CORTX-32693] Improve output of GC list

[jjxsg]

Added is_multipart flag in GC list output and updated deletion time to human readable time format.

Signed-off-by: Jeet Jain [email protected]

Checklist

• Tracker (select at least one)
  • References tracker ticket
  • Very recent bug; references commit where it was introduced
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[sachinpunadikar]

LGTM