Set proper IP family policy on NGINX LB Service (#3475)

[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. The IPFamilies list is populated automatically by k8s based on the policy.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.77%. Comparing base (00e246f) to head (74d9027).
Report is 1 commits behind head on release-2.0.

Additional details and impacted files

@@             Coverage Diff              @@
##           release-2.0    #3476   +/-   ##
============================================
  Coverage        86.77%   86.77%           
============================================
  Files              127      127           
  Lines            15068    15079   +11     
  Branches            62       62           
============================================
+ Hits             13075    13085   +10     
- Misses            1841     1842    +1     
  Partials           152      152           

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