Add Announcement to Disable Tenanted Passthrough

[msJinLei]

PR Summary

Announce the change to disable tenanted Passthrough token usage Azure/azure-powershell#26885

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributors guide.
• Style: This PR adheres to the style guide.

[github-actions]

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[learn-build-service-prod]

Learn Build status updates of commit 692e1d6:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
docs-conceptual/azps-13.0.0/disable-tenanted-passthrough.md	⚠️Warning	View (azps-13.0.0)	Details

docs-conceptual/azps-13.0.0/disable-tenanted-passthrough.md

• Line 31, Column 45: [Warning: hard-coded-locale - See documentation] Link 'https://learn.microsoft.com/en-us/entra/external-id/b2b-quickstart-add-guest-users-portal' contains locale code 'en-us'. For localizability, remove 'en-us' from links to most Microsoft sites.
• Line 31, Column 45: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/en-us/entra/external-id/b2b-quickstart-add-guest-users-portal' will be broken in isolated environments. Replace with a relative link.

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