✨ [RUM-6563] Attribute ressource URL to LCP

[RomanGaignault]

Motivation

LCP is often caused by a big image being rendered. If we can find which image was loaded at that time, we could have a field like: @view.largest_contentful_paint_resource_url:https://...

Changes

Adding new field to indicate the ressource url of the largest contentful paint

Testing

• Local
• Staging
• Unit
• End to end

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I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.45%. Comparing base (7ea12b0) to head (d314d33).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3154      +/-   ##
==========================================
+ Coverage   93.43%   93.45%   +0.01%     
==========================================
  Files         280      280              
  Lines        7679     7680       +1     
  Branches     1719     1720       +1     
==========================================
+ Hits         7175     7177       +2     
+ Misses        504      503       -1     

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