[RUMF-972] Revert "💥 always use alternative domains for RUM (#944)"

[BenoitZugmeyer]

Motivation

EU doesn't have the new intake domain available yet.

Changes

This reverts commit 6fd361c.

Testing

CI

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I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Merging #963 (864b9d8) into main (4950a32) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #963      +/-   ##
==========================================
+ Coverage   89.07%   89.09%   +0.02%     
==========================================
  Files          83       83              
  Lines        3871     3871              
  Branches      858      858              
==========================================
+ Hits         3448     3449       +1     
+ Misses        423      422       -1     

Impacted Files	Coverage Δ
packages/rum-core/src/boot/rumPublicApi.ts	97.95% <100.00%> (ø)
packages/core/src/tools/timeUtils.ts	93.93% <0.00%> (+3.03%)	⬆️

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