[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_python_parser/src/error.rs

@@ -126,8 +126,6 @@ pub enum ParseErrorType {
     /// A default value was found for a `*` or `**` parameter.
     VarParameterWithDefault,
 
-    /// A duplicate parameter was found in a function definition or lambda expression.
-    DuplicateParameter(String),
     /// A keyword argument was repeated.
     DuplicateKeywordArgumentError(String),
 
@@ -285,9 +283,6 @@ impl std::fmt::Display for ParseErrorType {
                 f.write_str("Invalid augmented assignment target")
             }
             ParseErrorType::InvalidDeleteTarget => f.write_str("Invalid delete target"),
-            ParseErrorType::DuplicateParameter(arg_name) => {
-                write!(f, "Duplicate parameter {arg_name:?}")
-            }
             ParseErrorType::DuplicateKeywordArgumentError(arg_name) => {
                 write!(f, "Duplicate keyword argument {arg_name:?}")
             }