Rollup merge of #123464 - fmease:rn-has-proj-to-has-aliases, r=compiler-errors

Cleanup: Rename `HAS_PROJECTIONS` to `HAS_ALIASES` etc.

The name of the bitflag `HAS_PROJECTIONS` and of its corresponding method `has_projections` is quite historical dating back to a time when projections were the only kind of alias type.

I think it's time to update it to clear up any potential confusion for newcomers and to reduce unnecessary friction during contributor onboarding.

r? types

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

@@ -1060,7 +1060,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
             // so we will try to normalize the obligation and evaluate again.
             // we will replace it with new solver in the future.
             if EvaluationResult::EvaluatedToErr == result
-                && fresh_trait_pred.has_projections()
+                && fresh_trait_pred.has_aliases()
                 && fresh_trait_pred.is_global()
             {
                 let mut nested_obligations = Vec::new();