💥 remove addError 'source' argument

[amortemousque]

Motivation

In order to avoid any confusion on how to enrich RUM data, we advice user to use addError context attribut.
In that regard, all errors captured with addError are now classified as custom.

Changes

Remove addError 'source' argument

Testing

Unit, Locally

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I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Merging #936 (e033d81) into prerelease-v3 (934166a) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@                Coverage Diff                @@
##           prerelease-v3     #936      +/-   ##
=================================================
- Coverage          89.02%   89.01%   -0.02%     
=================================================
  Files                 82       82              
  Lines               3864     3860       -4     
  Branches             865      863       -2     
=================================================
- Hits                3440     3436       -4     
  Misses               424      424              

Impacted Files	Coverage Δ
packages/rum-core/src/boot/rumPublicApi.ts	94.84% <100.00%> (-0.21%)	⬇️
...omain/rumEventsCollection/error/errorCollection.ts	70.37% <100.00%> (ø)

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