Set proper IP family policy on NGINX LB Service

[sjberman]

Problem: When provisioning the NGINX LoadBalancer Service, the IPFamily that's set in the NginxProxy resource (default dual) was not honored.

Solution: By default, set the IPFamily to PreferDualStack. If a user has specified otherwise in the NginxProxy resource, then set to SingleStack.

Testing: Verified that the NGINX Service has the proper IPFamily set based on what is in the NginxProxy resource, with DualStack being the default.

Closes #3473

Checklist

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• 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.

Fix an issue where the NGINX Service was not configured with the proper IPFamily.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.74%. Comparing base (dd86fec) to head (7a6fd13).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3475      +/-   ##
==========================================
- Coverage   86.77%   86.74%   -0.03%     
==========================================
  Files         127      127              
  Lines       15068    15079      +11     
  Branches       62       62              
==========================================
+ Hits        13075    13081       +6     
- Misses       1841     1845       +4     
- Partials      152      153       +1     

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