🐛 Fix proxy url intake detection

[amortemousque]

Motivation

With the current proxyUrl implementation, if a user set the same url for his proxy and his backend, we con't collect backend requests as resources.

Example:

init({proxyUrl: 'https://www.proxy.com'...})
fetch('https://www.proxy.com/foo') // no resource collected

Changes

Update buildIntakeUrl logic

Testing

• Local
• Staging
• Unit
• End to end

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I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Merging #1223 (c10c20d) into main (fea6134) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1223   +/-   ##
=======================================
  Coverage   89.00%   89.01%           
=======================================
  Files         101      101           
  Lines        4321     4324    +3     
  Branches      986      988    +2     
=======================================
+ Hits         3846     3849    +3     
  Misses        475      475           

Impacted Files	Coverage Δ
...s/core/src/domain/configuration/endpointBuilder.ts	100.00% <100.00%> (ø)

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