Change the group of startShadowScripts from application to other

[Goooler]

Aligns with https://github.com/gradle/gradle/blob/fdecc3c95828bb9a1c1bb6114483fe5b16f9159d/platforms/jvm/plugins-application/src/main/java/org/gradle/api/plugins/ApplicationPlugin.java#L183

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• CHANGELOG's "Unreleased" section has been updated, if applicable.

[Copilot]

Pull Request Overview

This PR changes the group assignment of the startShadowScripts task from application to other to align with how Gradle's ApplicationPlugin handles similar tasks.

• Removes the explicit group assignment for startShadowScripts task, allowing it to default to other
• Updates test expectations to reflect the group change
• Adds changelog entry documenting the change

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/main/kotlin/com/github/jengelman/gradle/plugins/shadow/ShadowApplicationPlugin.kt	Removes explicit APPLICATION_GROUP assignment from startShadowScripts task
src/test/kotlin/com/github/jengelman/gradle/plugins/shadow/ShadowPropertiesTest.kt	Updates test to remove group assertion for startShadowScripts and adds import for APPLICATION_GROUP
docs/changes/README.md	Documents the change in the unreleased changelog

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