Add archived field to GroupType and GroupChildEntity

Abdul Wadoodrequested to merge
481974-add-archived-attributes into master

What does this MR do and why?

Updates the GraphQL schema and serializer to include an archived field for both Group and Project types. The archived field uses the self_or_ancestors_archived? method to determine if a group or project is archived based on its own status or any ancestor's archived status.

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Related to #481974 (closed)

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