move test images to ecr public

[kishorj]

Issue

Move container image used for ingress e2e testing from GitHub to ECR public.

Description

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 🌟

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kishorj

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Needs approval from an approver in each of these files:

• OWNERS [kishorj]

Approvers can indicate their approval by writing /approve in a comment
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[codecov-commenter]

Codecov Report

Base: 54.09% // Head: 54.09% // No change to project coverage 👍

Coverage data is based on head (797e9bc) compared to base (edeb4f1).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2935   +/-   ##
=======================================
  Coverage   54.09%   54.09%           
=======================================
  Files         144      144           
  Lines        8291     8291           
=======================================
  Hits         4485     4485           
  Misses       3479     3479           
  Partials      327      327           

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[oliviassss]

lgtm