Fix healthcheck ports

[ciarams87]

Proposed changes

Don't set the upstream port as the default port for healthchecks - healthchecks will default to the port of the server instead (see https://nginx.org/en/docs/http/ngx_http_upstream_hc_module.html#health_check).

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 master
• I will ensure my PR is targeting the master branch and pulling from my branch from my own fork

[codecov-commenter]

Codecov Report

Merging #2378 (cec916e) into master (7ffcd5c) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2378      +/-   ##
==========================================
+ Coverage   53.66%   53.68%   +0.02%     
==========================================
  Files          48       48              
  Lines       14201    14199       -2     
==========================================
+ Hits         7621     7623       +2     
+ Misses       6340     6338       -2     
+ Partials      240      238       -2     

Impacted Files	Coverage Δ
internal/configs/version2/http.go	0.00% <ø> (ø)
internal/configs/transportserver.go	93.84% <100.00%> (-0.04%)	⬇️
internal/configs/virtualserver.go	95.32% <100.00%> (-0.01%)	⬇️
internal/k8s/configuration.go	95.86% <0.00%> (+0.38%)	⬆️

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