Added macos install cask & tarball preview article

[mikefrobbins]

PR Summary

Fixes AB#564254 - Added macos install cask and tarball preview article

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.

[learn-build-service-prod]

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[learn-build-service-prod]

Learn Build status updates of commit b713887:

✅ Validation status: passed

File	Status	Preview URL	Details
docs-ref-conceptual/Latest-version/install-azure-cli-macos-preview.md	✅Succeeded	View (azure-cli-latest)
docs-ref-conceptual/Latest-version/zone-pivot-groups.yml	✅Succeeded	View (azure-cli-latest)

For more details, please refer to the build report.

[dcaro]

I'm not sure if we need to have this

[dcaro]

Should we also consider having a section about the migration to the cask installation?

[dcaro]

Should we indicate that at that time, the current installation mecanism will be deprecated?

[Alex-AZPS]

here 2 options:

1. add more detail - On macOS, Azure CLI is evolving to support more secure authentication experiences, including broker-based authentication. These capabilities require a cask-based installation model.
   As a result, we are transitioning from Homebrew Core to Homebrew Cask. This change does not remove or limit any existing Azure CLI functionality—Homebrew Cask remains fully compatible with all current CLI features and versions.

2. just add one point - Required to support upcoming secure, broker-based authentication on macOS