Add SSLPolicy field to IngressClassParams

[johngmyers]

Issue

#2920

Description

Adds a sslPolicy field to IngressClassParams, permitting an IngressClass to override the SSL policy for all Ingresses in the class.

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

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 54.40%. Comparing base (e1fb94a) to head (aeef13e).
⚠️ Report is 633 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/ingress/model_build_listener.go	85.71%	1 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@ ## main #3025 +/- ## ========================================== + Coverage 54.32% 54.40% +0.07%  ========================================== Files 145 145 Lines 8410 8429 +19 ========================================== + Hits 4569 4586 +17  - Misses 3511 3512 +1  - Partials 330 331 +1 

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[kishorj]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: johngmyers, kishorj

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