Add IPv6 testing script for use in release process

[shaun-nx]

Proposed changes

This change adds a new directory to tests, containing files and scripts related to IPv6 testing.
This change also adds a new make target in tests/Makfile for running the test script as well as updates the release process documentation with steps and examples on how to run the IPv6 tests.

Closes #3774

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.

NONE

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.82%. Comparing base (8241478) to head (af1d32e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3931      +/-   ##
==========================================
- Coverage   86.83%   86.82%   -0.02%     
==========================================
  Files         128      128              
  Lines       16602    16602              
  Branches       62       62              
==========================================
- Hits        14417    14415       -2     
- Misses       2004     2005       +1     
- Partials      181      182       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[shaun-nx]

If anyone is curious as to why tests/suite/manifests/snippets-filter/invalid-duplicate-sf.yaml was modified, when running pre-commit locally, this file failed the yamllint check for me

yamllint.................................................................Failed
- hook id: yamllint
- exit code: 1
tests/suite/manifests/snippets-filter/invalid-duplicate-sf.yaml
  22:3      error    wrong indentation: expected 4 but found 2  (indentation)
  25:3      error    wrong indentation: expected 4 but found 2  (indentation)
  27:3      error    wrong indentation: expected 4 but found 2  (indentation)
  28:5      error    wrong indentation: expected 6 but found 4  (indentation)
  38:5      error    wrong indentation: expected 6 but found 4  (indentation)

Not sure if anyone else has hit this recently.

[shaun-nx]

@salonichf5 thanks for the great suggestions! This actually allowed the script to only require one parameter now, which is just the TAG.

I added a few new variables to the main Makefile too just so we can override some extra options when running make helm-install-local

[salonichf5]

overall looks good to me now except the last comment :)

[shaun-nx]

overall looks good to me now except the last comment :)

Do you mind if we merge this one as is? I was trying to change this over to use the make command instead, but I needed to allow the config file for the cluster to be configurable as well. It was kinda strange, when running the command with the new variables they were't getting passed...

It's probably something small, but given that we're focusing on the Openshift stuff I want to make sure I can put the time into that instead.