title	issue
Implement multi deleting variants	NEXT-20550

Administration

Added data variables toBeDeletedVariantsId in sw-product-variants-overview component
Added method onClickBulkDelete in sw-product-variants-overview component
Changed computed of canBeDeletedCriteria and the following methods in sw-product-variants-overview component:
- onVariationDelete
- onCloseDeleteModal
- onConfirmDelete
Added block sw_product_variants_overview_bulk in sw-product-variants-overview component template