Raise Unlicensed GraphQL errors.

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Some features exposed through GraphQL are only available in a certain license.

Right now we treat those as ResourceUnavailable, since we cannot hide the features from the schema as that's defined when the schema is loaded: Some namespaces would have the feature available, others wouldn't so we can't hide the fields globally.

It would be nice if instead of returning null from those fields, we'd raise a Gitlab::Graphql::Unlicensed error and potentially return which license contains the feature so the users could decide to upgrade if they want access to that feature.