[6.0] Update Azure.Identity and other dependencies (#3538) - #3553

Pull Request Overview

This PR updates Azure.Identity and other dependencies to newer versions as part of the release/6.0 branch maintenance. The update includes Azure SDK dependencies and adds pragma warnings to handle obsolete API warnings.

• Updates Azure.Identity from version 1.11.4 to 1.14.2
• Updates Azure.Core from 1.38.0 to 1.47.1 and Azure.Security.KeyVault.Keys from 4.5.0 to 4.7.0
• Adds pragma warning suppressions for obsolete MSAL.NET methods that are still supported

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 6 comments.