🔊[RUM-2324] Telemetry on LCP with startTime to 0

[amortemousque]

Motivation

Collect telemetry on LCP with startTime to 0:

{
  entry // the entry reported by the performanceObserver API
  previousNonZeroLcp,
  navigationStart // check if there is an unexpected navigationStart
  timeOrigin // check if there is an unexpected timeOrigin
  now: performance.now() // check the diff between now and the entry timings,
  visibilityState // check if these reports happens when "hidden" | "visible" | "prerender",
  prerendering: document.prerendering,
}

Changes

Add telemetry on LCP with a startTime at 0

Testing

• Local
• Staging
• Unit
• End to end

---

I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (603d6a0) 93.22% compared to head (decf74a) 93.14%.
Report is 16 commits behind head on main.

Files	Patch %	Lines
...in/view/viewMetrics/trackLargestContentfulPaint.ts	22.22%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2515      +/-   ##
==========================================
- Coverage   93.22%   93.14%   -0.08%     
==========================================
  Files         222      222              
  Lines        6654     6665      +11     
  Branches     1460     1463       +3     
==========================================
+ Hits         6203     6208       +5     
- Misses        451      457       +6     

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[bcaudan]

/to-staging

[dd-devflow]

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[bcaudan]

/to-staging -c

[dd-devflow]

🚂 Devflow: to-staging -c

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[dd-devflow]

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