Remove unused parser modes

<!--
Thank you for contributing to Ruff! To help us out with reviewing, please consider the following:

- Does this pull request include a summary of the change? (See below.)
- Does this pull request include a descriptive title?
- Does this pull request include references to any relevant issues?
-->

## Summary

This PR removes the `Interactive` and `FunctionType` parser modes that are unused by ruff

<!-- What's the purpose of the change? What does it do, and why? -->

## Test Plan

`cargo test`

<!-- How was it tested? -->

crates/ruff_python_ast/src/nodes.rs

@@ -10,9 +10,7 @@ use std::fmt::Debug;
 #[derive(Clone, Debug, PartialEq, is_macro::Is)]
 pub enum Mod {
     Module(ModModule),
-    Interactive(ModInteractive),
     Expression(ModExpression),
-    FunctionType(ModFunctionType),
 }
 
 /// See also [Module](https://docs.python.org/3/library/ast.html#ast.Module)
@@ -28,19 +26,6 @@ impl From<ModModule> for Mod {
     }
 }
 
-/// See also [Interactive](https://docs.python.org/3/library/ast.html#ast.Interactive)
-#[derive(Clone, Debug, PartialEq)]
-pub struct ModInteractive {
-    pub range: TextRange,
-    pub body: Vec<Stmt>,
-}
-
-impl From<ModInteractive> for Mod {
-    fn from(payload: ModInteractive) -> Self {
-        Mod::Interactive(payload)
-    }
-}
-
 /// See also [Expression](https://docs.python.org/3/library/ast.html#ast.Expression)
 #[derive(Clone, Debug, PartialEq)]
 pub struct ModExpression {
@@ -54,20 +39,6 @@ impl From<ModExpression> for Mod {
     }
 }
 
-/// See also [FunctionType](https://docs.python.org/3/library/ast.html#ast.FunctionType)
-#[derive(Clone, Debug, PartialEq)]
-pub struct ModFunctionType {
-    pub range: TextRange,
-    pub argtypes: Vec<Expr>,
-    pub returns: Box<Expr>,
-}
-
-impl From<ModFunctionType> for Mod {
-    fn from(payload: ModFunctionType) -> Self {
-        Mod::FunctionType(payload)
-    }
-}
-
 /// See also [stmt](https://docs.python.org/3/library/ast.html#ast.stmt)
 #[derive(Clone, Debug, PartialEq, is_macro::Is)]
 pub enum Stmt {
@@ -2474,28 +2445,16 @@ impl Ranged for crate::nodes::ModModule {
         self.range
     }
 }
-impl Ranged for crate::nodes::ModInteractive {
-    fn range(&self) -> TextRange {
-        self.range
-    }
-}
 impl Ranged for crate::nodes::ModExpression {
     fn range(&self) -> TextRange {
         self.range
     }
 }
-impl Ranged for crate::nodes::ModFunctionType {
-    fn range(&self) -> TextRange {
-        self.range
-    }
-}
 impl Ranged for crate::Mod {
     fn range(&self) -> TextRange {
         match self {
             Self::Module(node) => node.range(),
-            Self::Interactive(node) => node.range(),
             Self::Expression(node) => node.range(),
-            Self::FunctionType(node) => node.range(),
         }
     }
 }
@@ -3017,5 +2976,5 @@ mod size_assertions {
     assert_eq_size!(Expr, [u8; 80]);
     assert_eq_size!(Constant, [u8; 32]);
     assert_eq_size!(Pattern, [u8; 96]);
-    assert_eq_size!(Mod, [u8; 48]);
+    assert_eq_size!(Mod, [u8; 32]);
 }