Document beta archive mailbox redirects

[Mekaus]

Add archive redirect guidance to supported beta Mail API operations and surface the shared handling article in Mail and mailbox import/export navigation.

Co-authored-by: Copilot 223556219+Copilot@users.noreply.github.com

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Required for API changes:

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[learn-build-service-prod]

Learn Build status updates of commit cf54d32:

✅ Validation status: passed

File	Status	Preview URL	Details
api-reference/beta/api/mailfolder-delta.md	✅Succeeded
api-reference/beta/api/mailfolder-get.md	✅Succeeded
api-reference/beta/api/mailfolder-list-childfolders.md	✅Succeeded
api-reference/beta/api/mailfolder-list-messages.md	✅Succeeded
api-reference/beta/api/mailfolder-post-messages.md	✅Succeeded
api-reference/beta/api/message-delete.md	✅Succeeded
api-reference/beta/api/message-delta.md	✅Succeeded
api-reference/beta/api/message-get.md	✅Succeeded
api-reference/beta/api/user-list-mailfolders.md	✅Succeeded
api-reference/beta/toc/toc.mapping.json	✅Succeeded

For more details, please refer to the build report.