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

Base: 54.31% // Head: 54.37% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (72dbbb6) compared to base (fb96e58).
Patch coverage: 87.50% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3025      +/-   ##
==========================================
+ Coverage   54.31%   54.37%   +0.05%     
==========================================
  Files         145      145              
  Lines        8412     8414       +2     
==========================================
+ Hits         4569     4575       +6     
+ Misses       3513     3509       -4     
  Partials      330      330              

Impacted Files	Coverage Δ
pkg/ingress/model_build_listener.go	48.78% <85.71%> (+0.84%)	⬆️
pkg/ingress/model_builder.go	65.85% <100.00%> (+1.95%)	⬆️

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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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