Adding endpoint for fetching attributes of a single group.

[krulis-martin]

No description provided.

[Copilot]

Pull Request Overview

This PR adds a new endpoint for fetching external attributes of a single group, providing webapp with a convenient way to retrieve and display group-specific attributes.

• Adds new GET endpoint /groupExternalAttributes/<groupId> to retrieve attributes for a specific group
• Implements actionGet method with proper ACL checks to fetch group external attributes
• Includes comprehensive test coverage for the new endpoint functionality

Reviewed Changes

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

File	Description
app/V1Module/router/RouterFactory.php	Adds route configuration for the new group attributes endpoint
app/V1Module/presenters/GroupExternalAttributesPresenter.php	Implements the new actionGet method with ACL validation
tests/Presenters/GroupExternalAttributesPresenter.phpt	Adds test case to verify the new endpoint functionality

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