Run functional tests with LoadBalancer

[lucacome]

Proposed changes

Problem: Most users will install NGF with a Service type LoadBalancer, but we run our tests with NodePort

Solution: Switch to using LoadBalancer in the pipeline

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

[ciarams87]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.00%. Comparing base (051238f) to head (8fb3456).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2075      +/-   ##
==========================================
+ Coverage   87.61%   95.00%   +7.38%     
==========================================
  Files          96        1      -95     
  Lines        6694      220    -6474     
  Branches       50       50              
==========================================
- Hits         5865      209    -5656     
+ Misses        773       11     -762     
+ Partials       56        0      -56     

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