✨ [RUMF-863] Enable console error with stack traces

[bcaudan]

Motivation

cf #762:

• remove error stack from raw error message
• set raw error stack to first error instance stack

Changes

Remove feature flag + outdated tests

Testing

unit

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I have gone over the contributing documentation.

[codecov-io]

Codecov Report

Merging #781 (b020e25) into master (ea52019) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #781      +/-   ##
==========================================
- Coverage   86.33%   86.31%   -0.02%     
==========================================
  Files          76       76              
  Lines        3614     3611       -3     
  Branches      833      832       -1     
==========================================
- Hits         3120     3117       -3     
  Misses        494      494              

Impacted Files	Coverage Δ
...ckages/core/src/domain/automaticErrorCollection.ts	98.59% <100.00%> (-0.06%)	⬇️

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