Agent Config Parsing Casing Fixes

[mattiekat]

Description

This is a fix for an issue in the arguments and environment where we are unable to correctly support attribute names due to the casing. The main issue cannot be fully fixed practically by this PR because it would cause some configuration cases to break. For now it adds manual exceptions for the command line argument case and leaves envs as they were. There are then two new parsers that can be used with the new config format.

Drive-by changes

Also adds this to argument parser since it was trivial to copy/paste it and it will allow us to harden parsing when we switch over.

Related issues

• Fixes bug(rust): CLI argument parser doesn't work for some configurations. #2662
• Fixes bug(rust): Environment variables are not parsed correctly for some configurations #2663
• Progress on Streamline config shapes (rust) #2215

Backward compatibility

Yes

Testing

Unit Tests

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (0d3dd60) 64.61% compared to head (fc4b509) 64.61%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2666   +/-   ##
=======================================
  Coverage   64.61%   64.61%           
=======================================
  Files          90       90           
  Lines        1379     1379           
  Branches      182      182           
=======================================
  Hits          891      891           
  Misses        481      481           
  Partials        7        7           

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