Remove deleted gradle API used by buildsystem plugin, Fixes AB#3689387

[ridam-arora]

AB#3689387

Changes the gradle API used by this plugin to set the sourceCompatibility and targetCompatibility properties. the API JavaPluginConvention has been deleted in gradle 9+

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[Copilot]

Pull request overview

Updates the internal plugins/buildsystem Gradle plugin to avoid Gradle 9+ removed APIs by switching Java compatibility configuration to JavaPluginExtension, and adds internal feed publishing configuration for the plugin artifact.

Changes:

• Replace legacy Java compatibility configuration with JavaPluginExtension#setSourceCompatibility/#setTargetCompatibility.
• Add a changelog entry for the Gradle API migration.
• Bump plugin version and add publishing repository config targeting the NewAndroid Azure Artifacts feed.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
plugins/buildsystem/src/main/java/com/microsoft/identity/buildsystem/BuildPlugin.java	Switch Java source/target compatibility configuration to JavaPluginExtension (Gradle 9+ compatible).
plugins/buildsystem/changelog	Add release notes entry documenting removal of deleted Gradle APIs.
plugins/buildsystem/build.gradle	Bump plugin version and add internal Azure Artifacts publishing repository configuration.