Dashboard needs to include IPv6 addresses for seed nodes

[tegefaulkes]

Specification

Currently the dashboard shows IPv4 addresses for the seed nodes. We also need to include the IPv6 addresses in the dashboard.

Additional context

• Node crashes/exits ungracefully on uncaught exceptions/events relating to QUIC connections or QUIC streams Polykey-CLI#198 (comment)

Tasks

1. Add IPv6 addresses for the seed nodes to the dashboard.

[linear]

ENG-487 Dashboard needs to include IPv6 addresses for seed nodes