Extend QueryStability to handle IntoIterator implementations

Fix adjacent code

Fix duplicate warning; merge test into `tests/ui-fulldeps/internal-lints`

Use `rustc_middle::ty::FnSig::inputs`

Address two review comments

- https://github.com/rust-lang/rust/pull/139345#discussion_r2109006991
- https://github.com/rust-lang/rust/pull/139345#discussion_r2109058588

Use `Instance::try_resolve`

Import `rustc_middle::ty::Ty` as `Ty` rather than `MiddleTy`

Simplify predicate handling

Add more `#[allow(rustc::potential_query_instability)]` following rebase

Remove two `#[allow(rustc::potential_query_instability)]` following rebase

Address review comment

Update compiler/rustc_lint/src/internal.rs

Co-authored-by: lcnr <rust@lcnr.de>

compiler/rustc_codegen_ssa/src/target_features.rs

@@ -180,6 +180,7 @@ fn parse_rust_feature_flag<'a>(
             while let Some(new_feature) = new_features.pop() {
                 if features.insert(new_feature) {
                     if let Some(implied_features) = inverse_implied_features.get(&new_feature) {
+                        #[allow(rustc::potential_query_instability)]
                         new_features.extend(implied_features)
                     }
                 }