fix(memberlist): allow resolution of advertise address from v6 interf…

[ashwanthgoli]

What this PR does / why we need it:

#13940 introduced a change for memberlist to pick address from the interfaces defined in common instance_interface_names (previously it iterated over all available interfaces), but the method used only resolves v4 addresses.

This breaks memberlist for anyone using v6 only interfaces. This PR updates memberlist to look-up t.Cfg.Common.Ring.EnableIPv6 flag to enable the resolution of v6 addresses.

Note: Individual components are allowed to specify their own list of interfaces using <component_name>.ring.instance-interface-names but memberlist does not consider the component specific setting yet. This should be fixed in the long term.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Checklist

• Reviewed the CONTRIBUTING.md guide (required)
• Documentation added
• Tests updated
• Title matches the required conventional commits format, see here
  • Note that Promtail is considered to be feature complete, and future development for logs collection will be in Grafana Alloy. As such, feat PRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.
• Changes that require user attention or interaction to upgrade are documented in docs/sources/setup/upgrade/_index.md
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[ashwanthgoli]

this line of change is a no-op as Common.Ring.InstanceInterfaceNames is set from Common.InstanceInterfaceNames unless the user has explicitly configured different values for them - not sure if doing that makes sense.

I updated this as memberlist is the underlying transport for the ring, it makes sense for it to inherit ring settings rather than loki level settings.

[slim-bean]

LGTM, tricky to do this in a way that doesn't lead to an unexpected result for one version of a config vs another, I like this approach.