Auto merge of #106253 - nbdd0121:upcast, r=compiler-errors

Skip possible where_clause_object_safety lints when checking `multiple_supertrait_upcastable`

Fix #106247

To achieve this, I lifted the `WhereClauseReferencesSelf` out from `object_safety_violations` and move it into `is_object_safe` (which is changed to a new query).

cc `@dtolnay`
r? `@compiler-errors`

compiler/rustc_traits/src/chalk/db.rs

@@ -580,7 +580,7 @@ impl<'tcx> chalk_solve::RustIrDatabase<RustInterner<'tcx>> for RustIrDatabase<'t
     }
 
     fn is_object_safe(&self, trait_id: chalk_ir::TraitId<RustInterner<'tcx>>) -> bool {
-        self.interner.tcx.is_object_safe(trait_id.0)
+        self.interner.tcx.check_is_object_safe(trait_id.0)
     }
 
     fn hidden_opaque_type(