✨ [RUM-1214] Collect core web vitals target selectors

[amortemousque]

Motivation

Currently the web vitals are reported with a single value representing the vital score. These scores provide valuable insights to customers, allowing them to determine the performance quality of their website. However, to effectively improve them, it is crucial to identify the specific component to which a vital refers.

Changes

Remove web_vitals_attribution feature flag

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 ✅

Comparison is base (279ccd2) 93.24% compared to head (574a6f3) 93.23%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2506      +/-   ##
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- Coverage   93.24%   93.23%   -0.01%     
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  Files         222      222              
  Lines        6662     6654       -8     
  Branches     1467     1460       -7     
==========================================
- Hits         6212     6204       -8     
  Misses        450      450              

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