🔥 recorder: remove forEach polyfills

[bcaudan]

Motivation

Avoid to touch shared API if it is not needed

Changes

Replace forEach polyfills by a forEach utility function

Testing

ci

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I have gone over the contributing documentation.

[codecov-io]

Codecov Report

Merging #719 (e0d3b9a) into master (e6d6265) will increase coverage by 0.16%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #719      +/-   ##
==========================================
+ Coverage   80.50%   80.66%   +0.16%     
==========================================
  Files          71       71              
  Lines        3739     3729      -10     
  Branches      887      883       -4     
==========================================
- Hits         3010     3008       -2     
+ Misses        729      721       -8     

Impacted Files	Coverage Δ
...rum-recorder/src/domain/rrweb-snapshot/snapshot.ts	58.24% <0.00%> (+1.15%)	⬆️
packages/rum-recorder/src/domain/rrweb/observer.ts	55.02% <0.00%> (ø)
packages/rum-recorder/src/domain/rrweb/record.ts	64.15% <ø> (-0.34%)	⬇️
packages/rum-recorder/src/domain/rrweb/utils.ts	45.54% <50.00%> (+0.35%)	⬆️
packages/rum-recorder/src/domain/rrweb/mutation.ts	56.50% <75.00%> (ø)

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