Rollup merge of #102786 - compiler-errors:no-tuple-candidate, r=lcnr

Remove tuple candidate, nothing special about it

r? `@lcnr` you mentioned this during the talk you gave i think

compiler/rustc_trait_selection/src/traits/select/confirmation.rs

@@ -126,8 +126,6 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                 let data = self.confirm_const_destruct_candidate(obligation, def_id)?;
                 ImplSource::ConstDestruct(data)
             }
-
-            TupleCandidate => ImplSource::Tuple,
         };
 
         if !obligation.predicate.is_const_if_const() {