chore: configurable transformer http client in processor, router

[Sidddddarth]

Description

Configurable http Client(Doer) in processor, rt transformers. Doesn't include oauth clients in rt transform at this point.

Linear Ticket

On top of #5451

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Attention: Patch coverage is 57.81250% with 54 lines in your changes missing coverage. Please review.

Project coverage is 74.78%. Comparing base (2bcb2c6) to head (97d1aad).

Files with missing lines	Patch %	Lines
internal/transformer-client/client.go	35.71%	52 Missing and 2 partials ⚠️

Additional details and impacted files

@@                    Coverage Diff                     @@
##           chore.configurableCSLB    #5455      +/-   ##
==========================================================
+ Coverage                   74.73%   74.78%   +0.05%     
==========================================================
  Files                         440      441       +1     
  Lines                       61699    61761      +62     
==========================================================
+ Hits                        46108    46189      +81     
+ Misses                      13045    13032      -13     
+ Partials                     2546     2540       -6     

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