Upgrade MSAL dependencies to 4.79.2

[Copilot]

Description

Upgrades Microsoft Identity Client (MSAL) dependencies from 4.78.0 to 4.79.2 for Azure.Identity and Azure.Identity.Broker.

Changes

• Dependencies: Updated Microsoft.Identity.Client, Microsoft.Identity.Client.Extensions.Msal, and Microsoft.Identity.Client.Broker to 4.79.2 in eng/Packages.Data.props

• API Compatibility: Suppressed obsolete warning in ManagedIdentityClient.cs for GetManagedIdentitySource() static method. Method remains functional; deprecation targets instance usage pattern.

• Test Infrastructure: Made StaticCachesUtilities.cs resilient to MSAL internal API changes by gracefully handling missing reflection targets

• Changelog: Added entries documenting dependency updates in both Azure.Identity/CHANGELOG.md and Azure.Identity.Broker/CHANGELOG.md

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• Please add REST spec PR link to the SDK PR
• I have read the contribution guidelines.
• The pull request does not introduce breaking changes.

General Guidelines

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

SDK Generation Guidelines

• If an SDK is being regenerated based on a new swagger spec, a link to the pull request containing these swagger spec changes has been included above.
• The generate.cmd file for the SDK has been updated with the version of AutoRest, as well as the commitid of your swagger spec or link to the swagger spec, used to generate the code.
• The *.csproj and AssemblyInfo.cs files have been updated with the new version of the SDK.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Upgrade MSAL dependencies for Azure Identity to latest</issue_title>
<issue_description>Upgrade Microsoft.Identity.Client and Microsoft.Identity.Client.Extensions dependencies for Azure.Identity to the latest ones.

Specific tasks

1. Update the dependencies in eng/Packages.Data.props.
2. Ensure the Azure.Identity (sdk/identity/Azure.Identity) builds.
3. Add a Changelog entry

Versions

Package	Current version	Latest version
Microsoft.Identity.Client	4.78.0	4.79.2
Microsoft.Identity.Client.Extensions	4.78.0	4.79.2
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Upgrade MSAL dependencies for Azure Identity to latest #54665

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[JonathanCrd]

Holding this PR until 4.80.0 becomes available