Added message about pausing lts releases

[mikefrobbins]

PR Summary

Fixes AB#537452 - 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.
• Contributor's Guide: I have read the contributors guide.
• Style: This PR adheres to the style guide.

[Copilot]

Pull request overview

This PR adds an important notice to the Azure PowerShell support lifecycle documentation announcing a temporary pause of Long-Term Support (LTS) releases while the team evaluates alternative support approaches.

Key Changes:

• Added an IMPORTANT callout box explaining the pause of LTS releases
• Clarified that STS releases continue as scheduled during this pause
• Provided context about ongoing evaluation of alternative support approaches

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[learn-build-service-prod]

PoliCheck Scan Report

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[learn-build-service-prod]

Learn Build status updates of commit 6c9aa14:

✅ Validation status: passed

File	Status	Preview URL	Details
docs-conceptual/azps-15.0.0/azureps-support-lifecycle.md	✅Succeeded	View (azps-15.0.0)

For more details, please refer to the build report.