enable ingress instance e2e test for ipv6

[oliviassss]

Issue

Description

1. Enable ingress e2e test suites for instance ipv6 target type
2. Update prow script to run ingress and service instance test suites for ipv6 clusters

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (eacb0c3) 55.76% compared to head (30bdf8e) 55.76%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3416   +/-   ##
=======================================
  Coverage   55.76%   55.76%           
=======================================
  Files         149      149           
  Lines        8827     8827           
=======================================
  Hits         4922     4922           
  Misses       3571     3571           
  Partials      334      334           

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[johngmyers]

It might be useful to test dualstack load balancers on IPv4 clusters, but that's orthogonal.

/lgtm

[johngmyers]

/assign @M00nF1sh

[johngmyers]

One wrinkle with IPv6 instance targets is that the instances must have a primary IPv6 address or the targets won't register. Primary IPv6 addresses are a relatively newish concept, so not all tools support them yet. For example, the Terraform AWS provider doesn't support it yet: hashicorp/terraform-provider-aws#33733

[M00nF1sh]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: M00nF1sh, oliviassss

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