[Email Worker] Update type

[harshil1712]

Summary

Update the types and also added note for Service Workers code snippet.

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Updated types and added a caution note regarding the deprecation of Service Workers in the email routing documentation.

• Updated the type from EmailMessage to ForwardableEmailMessage.
• Added a caution note indicating that Service Workers are deprecated but still supported.
• Provided an example of handling EmailEvent using Service Worker syntax.

Modified Files

• src/content/docs/email-routing/email-workers/runtime-api.mdx

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[github-actions]

Preview URL: https://f638f0bc.preview.developers.cloudflare.com
Preview Branch URL: https://email-worker-type-fix.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/email-routing/email-workers/runtime-api/	https://email-worker-type-fix.preview.developers.cloudflare.com/email-routing/email-workers/runtime-api/