Added message about pausing lts releases

[mikefrobbins]

PR Summary

Fixes AB#538832 - Added message about pausing lts releases

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 bc9e1ff:

✅ Validation status: passed

File	Status	Preview URL	Details
docs-ref-conceptual/Latest-version/azure-cli-support-lifecycle.md	✅Succeeded	View (azure-cli-latest)

For more details, please refer to the build report.

[Copilot]

Pull request overview

This PR adds an important notice to the Azure CLI support lifecycle documentation informing users that Long-Term Support (LTS) releases are temporarily paused while the team evaluates improved support approaches.

• Adds a prominent IMPORTANT callout box to the LTS section
• Clarifies that STS releases continue as normal during the pause
• Explains the implications and future plans regarding LTS releases

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