Auto merge of #125076 - compiler-errors:alias-term, r=lcnr

Split out `ty::AliasTerm` from `ty::AliasTy`

Splitting out `AliasTerm` (for use in project and normalizes goals) and `AliasTy` (for use in `ty::Alias`)

r? lcnr

compiler/rustc_trait_selection/src/traits/query/normalize.rs

@@ -222,7 +222,7 @@ impl<'cx, 'tcx> FallibleTypeFolder<TyCtxt<'tcx>> for QueryNormalizer<'cx, 'tcx>
                                 .infcx
                                 .err_ctxt()
                                 .build_overflow_error(
-                                    OverflowCause::DeeplyNormalize(data),
+                                    OverflowCause::DeeplyNormalize(data.into()),
                                     self.cause.span,
                                     true,
                                 )