chore(warehouse): add user transformer url env

[Jayachand]

Description

adding different env pointing to user transformer service

Notion Ticket

https://www.notion.so/rudderstacks/separate-out-user-transformer-dest-transformer-deployments-6c7b62acdc08462cb45f696f3f6cd52e

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

Base: 43.77% // Head: 43.74% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (33cb739) compared to base (e9aff77).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2651      +/-   ##
==========================================
- Coverage   43.77%   43.74%   -0.03%     
==========================================
  Files         187      187              
  Lines       39993    39993              
==========================================
- Hits        17507    17496      -11     
- Misses      21387    21400      +13     
+ Partials     1099     1097       -2     

Impacted Files	Coverage Δ
services/stats/stats.go	88.48% <0.00%> (-1.82%)	⬇️
processor/processor.go	71.19% <0.00%> (-0.83%)	⬇️
config/backend-config/namespace_config.go	73.95% <0.00%> (+3.12%)	⬆️
middleware/middleware.go	94.82% <0.00%> (+8.62%)	⬆️

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