[Email Security] Update Migration guide

[Maddy-Cloudflare]

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[hyperlint-ai]

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PR Change Summary

Updated the migration guide for Email Security with new information regarding webhooks, email alerts, support requests, and API deprecation.

• Added notes about the visibility and configuration of Area 1 webhooks in Zero Trust Email Security.
• Included information on email alerts and monitoring in Email Security.
• Updated support request procedures transitioning from Area 1 to Cloudflare dashboard.
• Noted the deprecation of Area 1 API endpoints and provided links to the Email Security API.

Modified Files

• src/content/docs/email-security/migrate-to-email-security.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/email-security/	@Maddy-Cloudflare, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://0899dd68.preview.developers.cloudflare.com
Preview Branch URL: https://maddy-email-security-pcx-18389.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/email-security/migrate-to-email-security/	https://maddy-email-security-pcx-18389.preview.developers.cloudflare.com/email-security/migrate-to-email-security/

[caley-b]

Tiny comments that you can ignore if they don't make sense or don't feel necessary. Non-blocking.