docs(cloudflare): Add info why CF_VERSION_METADATA is used

[JPeer264]

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This clarifies why the CF_VERSION_METADATA is added and links to the Cloudflare page that gives more context for the value.

closes FE-544

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[linear]

FE-544 Add rationale for keeping CF_VERSION_METADATA in onboarding section

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Project	Deployment	Review	Updated (UTC)
sentry-docs	Ready	Preview, Comment	Jan 14, 2026 10:26am

1 Skipped Deployment

Project	Deployment	Review	Updated (UTC)
develop-docs	Ignored		Jan 14, 2026 10:26am

[s1gr1d]

It's not necessarily needed to add this. Should we reword the sentence a bit so it's clear that this is optional? Maybe with "you can add ..."