Geo primary verification: filter out singular name parameter

Chloe Fonsrequested to merge
582655-geo-primary-verification-match-view-controller-error-state-to-api into master

What does this MR do and why?

Match view controller error state to API for data management routes

Update the data management controller to return 404 for singular model names (e.g., admin/data_management/upload), matching API behavior. Add validation using singular_model_name? helper and update tests to cover the singular route case.

References

#582655

How to set up and validate locally

  1. Make sure you've got a Geo-enabled GDK.
  2. Navigate to /admin/data_management/uploads => the page loads (in some capacity, the UI fix is not yet merged)
  3. Navigate to /admin/data_management/upload => the page render a 404

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