✨ [RUM-6567] Generate new web vitals attribution fields

[sethfowler-datadog]

Motivation

This PR adds code to generate the new web vitals attribution fields that were added to the event format in this PR.

For now, the old web vitals fields remain. To remove them safely without breaking backwards compatibility, we need backend changes, so we'll hold off until those are done.

Changes

• The rum-events-format submodule has been updated to include the new fields.
• The new fields have been added to the appropriate type definitions.
• The code to populate the new fields has been added to viewCollection.ts.
• The tests have been updated appropriately.

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 93.49%. Comparing base (356436d) to head (9102f3f).
Report is 6 commits behind head on v6.

Additional details and impacted files

@@            Coverage Diff             @@
##               v6    #3251      +/-   ##
==========================================
- Coverage   93.50%   93.49%   -0.01%     
==========================================
  Files         288      288              
  Lines        7590     7597       +7     
  Branches     1726     1731       +5     
==========================================
+ Hits         7097     7103       +6     
- Misses        493      494       +1     

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[sethfowler-datadog]

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2025-01-08 14:19:04 UTC ℹ️ Branch Integration: starting soon, median merge time is 11m40s

Commit 9102f3f453 will soon be integrated into staging-02.

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2025-01-08 14:19:27 UTC 🚨 Branch Integration: This merge request has conflicts

We couldn't automatically merge the commit 9102f3f453 into staging-02!

You can use this resolution PR: #3267 to fix the conflicts.

[sethfowler-datadog]

/to-staging -c

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2025-01-08 15:43:11 UTC ❌ Devflow: /to-staging -c

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