Geo Primary Verification: Match view controller error state to API error state for data management routes

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Summary

Follow-up to !214542 (merged)

When visiting the old route format (e.g., admin/data_management/upload), the API correctly returns a 400 error, but the view controller still returns 200. This creates confusion for users manipulating the URL.

Proposal

Update the view controller to reject improper routes with a 404 error to match the API behavior.

Suggested approach: Re-use AVAILABLE_MODEL_NAMES = Gitlab::Geo::ModelMapper.available_model_names.map(&:pluralize).freeze to validate routes in the controller.

Related

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