[Web Analytics] Removes FID from docs

[angelampcosta]

Summary

Removes FID from docs.

Documentation checklist

• The documentation style guide has been adhered to.

[hyperlint-ai]

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PR Change Summary

Removed references to First Input Delay (FID) from the documentation on Core Web Vitals.

• Deleted FID metric description from the Core Web Vitals section
• Updated tables to remove FID references
• Removed additional data collection details related to FID

Modified Files

• src/content/docs/web-analytics/data-metrics/core-web-vitals.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/web-analytics/	@angelampcosta, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://69012736.preview.developers.cloudflare.com
Preview Branch URL: https://angela-remove-fid.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/web-analytics/data-metrics/core-web-vitals/	https://angela-remove-fid.preview.developers.cloudflare.com/web-analytics/data-metrics/core-web-vitals/