FBA Removal Shipment deduplicated

The unique key in fba_removal_shipment_detail is now fully reliable and historical duplicates have been removed.

SELLING_PARTNER.FBA_REMOVAL_SHIPMENT_DETAIL no longer contains duplications.

The definition of the _unique_key of the table has been changed after we discovered that the shipment_date can change over time. The _unique_key is now fully reliable and the dataset has been fully refreshed to remove all duplicated keys.

Concerned table: SELLING_PARTNER.FBA_REMOVAL_SHIPMENT_DETAIL