Replace ApplyMetadataValidationView with partial render of the top view
Replace ApplyMetadataValidationView with partial render of the top view

Now that ApplyMetadataValidationView triggers no events and simply
updates in response to model/collection changes, it makes sense to
remove the view and instead render the validation section directly in
the top view.

As a result, this removes the need to copy the MetadataFileModel
attributes, which was used only as a mechanism to trigger the validation
view update.

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