Refactor virtual server listens with makeHTTP(s)Listener functions

[j1m-ryan]

Proposed changes

This refactor moves listen logic from two go template files nginx.virtualserver.tmpl and nginx-plus.virtualserver.tmpl , to the template_helper.go file

It adds two functions to be used in these files, makeHTTPListener and makeHTTPSListener

#4234

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (40979b3) 51.92% compared to head (8c23ebf) 52.09%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4693      +/-   ##
==========================================
+ Coverage   51.92%   52.09%   +0.16%     
==========================================
  Files          59       59              
  Lines       16973    17033      +60     
==========================================
+ Hits         8813     8873      +60     
  Misses       7862     7862              
  Partials      298      298              

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[jjngx]

👍🏻 great to see template logic moved to tested functions! 🚀