chore: webhook v0 deprecation while defaulting to v1

[vinayteki95]

Description

Deprecation of webhook transformer service v0 adapter as a preliminary step to move towards v2 spec. This is stage 0 of 3 for v2 spec upgrade. Details regarding this upgrade can be found in this notion doc

Linear Ticket

Corresponding linear ticket can be found here. Resolves INT-2754

Note:

This will be a breaking change for older rudder-transformer versions. (older than 1.50.0 rudder-transformer)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.

Project coverage is 73.23%. Comparing base (ab62155) to head (998631f). Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
services/transformer/features.go	0.00%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5187      +/-   ##
==========================================
+ Coverage   73.18%   73.23%   +0.04%     
==========================================
  Files         417      417              
  Lines       59532    59532              
==========================================
+ Hits        43568    43596      +28     
+ Misses      13523    13505      -18     
+ Partials     2441     2431      -10     

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