update prow script to enable primary ipv6 address

[oliviassss]

Issue

Description

Enable primary ipv6 address as the pre-requisite for ALB/NLB instance test cases in ipv6 prow 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 and coverable lines are covered by tests ✅

Comparison is base (2765407) 55.75% compared to head (7247b5c) 55.75%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3510   +/-   ##
=======================================
  Coverage   55.75%   55.75%           
=======================================
  Files         149      149           
  Lines        8843     8843           
=======================================
  Hits         4930     4930           
  Misses       3579     3579           
  Partials      334      334           

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[jaydeokar]

lgtm

[orsenthil]

LGTM

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: jaydeokar, oliviassss, orsenthil
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