[ACR] az acr config content-trust update, az acr check-health: Add breaking changes announcement

[lizMSFT]

Related command
az acr config content-trust update
az acr check-health

Description
Azure Container Registry will retire Docker Content Trust on March 31, 2028. For more details, refer to https://aka.ms/acr/dctdeprecation.

• Add a breaking change announcement for az acr config content-trust update stating that the enabled status value will no longer be accepted in the next breaking change release.
• Add a breaking change announcement for az acr check-health stating that the Notary client check will be removed in the next breaking change release.

Testing Guide

History Notes
[ACR] az acr config content-trust update: add breaking changes announcement that enabled status will no longer be accepted
[ACR] az acr check-health: add breaking change announcement that Notary client check will be removed

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[Copilot]

Pull request overview

This PR adds breaking change announcements for two Azure Container Registry (ACR) commands in preparation for the deprecation of Docker Content Trust on March 31, 2028.

• Imports register_logic_breaking_change function from the core breaking change module
• Registers breaking change for az acr check-health to notify users that Notary client version validation will be removed
• Registers breaking change for az acr config content-trust update to notify users that the --status enabled parameter will no longer be accepted

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