[Release-1.27] Added support for env *_PROXY variables for agent loadbalancer

[dereknola]

Backport #9070 to release-1.27

Linked Issues

#9114

User-Facing Change

Further Comments

[codecov]

Codecov Report

Attention: 23 lines in your changes are missing coverage. Please review.

Comparison is base (2c249a3) 50.19% compared to head (a37aaed) 46.67%.

Files	Patch %	Lines
pkg/agent/loadbalancer/servers.go	32.35%	23 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.27    #9117      +/-   ##
================================================
- Coverage         50.19%   46.67%   -3.52%     
================================================
  Files               148      148              
  Lines             15768    15798      +30     
================================================
- Hits               7914     7373     -541     
- Misses             6613     7223     +610     
+ Partials           1241     1202      -39     

Flag	Coverage Δ
e2etests	?
inttests	44.22% <32.35%> (-0.20%)	⬇️
unittests	18.41% <32.35%> (+0.01%)	⬆️

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