[syntax-errors] Make duplicate parameter names a semantic error (#17131)

Status
--

This is a pretty minor change, but it was breaking a red-knot mdtest
until #17463 landed. Now this should close #11934 as the last syntax
error being tracked there!

Summary
--

Moves `Parser::validate_parameters` to
`SemanticSyntaxChecker::duplicate_parameter_name`.

Test Plan
--

Existing tests, with `## Errors` replaced with `## Semantic Syntax
Errors`.

crates/ruff_linter/src/checkers/ast/mod.rs

@@ -615,7 +615,8 @@ impl SemanticSyntaxContext for Checker<'_> {
             | SemanticSyntaxErrorKind::DuplicateMatchKey(_)
             | SemanticSyntaxErrorKind::DuplicateMatchClassAttribute(_)
             | SemanticSyntaxErrorKind::InvalidStarExpression
-            | SemanticSyntaxErrorKind::AsyncComprehensionOutsideAsyncFunction(_) => {
+            | SemanticSyntaxErrorKind::AsyncComprehensionOutsideAsyncFunction(_)
+            | SemanticSyntaxErrorKind::DuplicateParameter(_) => {
                 if self.settings.preview.is_enabled() {
                     self.semantic_errors.borrow_mut().push(error);
                 }