op-mode: T5992: show dhcpv6 leases with (mostly) the same fields as dhcp leases

[nvandamme]

Change summary

Changed leases table headers for dhcpv6 leases to reflect mostly the same fields and order of dhcpv4 leases with respective op commands.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

• https://vyos.dev/T5992

Related PR(s)

How to test / Smoketest result

vyos@vyos:~$ show dhcpv6 server leases

IPv6 address	MAC address	State	Last communication	Lease expiration	Remaining	Pool	Hostname	Type	DUID
xxxx:xxxx:xxxx:xxxx::xxxx	xx:xx:xx:xx:xx:xx	active	2025/01/08 14:17:04	2025/01/08 16:17:04	1:46:14	LAN	dummy	IA_NA	00:03:00:01:xx:xx:xx:xx:xx:xx

vyos@vyos:~$ show dhcp server leases

IP Address	MAC address	State	Lease start	Lease expiration	Remaining	Pool	Hostname	Origin
xxx.xxx.xxx.xxx	xx:xx:xx:xx:xx:xx	active	2025/01/08 09:09:00	2025/01/09 09:09:00	18:07:38	LAN	dummy	local

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

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• CLI Smoketests (interfaces only) 👍 passed
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