Delete type-ignore node

<!--
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 type ignore node from the AST because our parser doesn't support it, and just having it around is confusing.

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

## Test Plan

`cargo build`

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

crates/ruff_python_formatter/src/module/mod_module.rs

@@ -9,13 +9,7 @@ pub struct FormatModModule;
 
 impl FormatNodeRule<ModModule> for FormatModModule {
     fn fmt_fields(&self, item: &ModModule, f: &mut PyFormatter) -> FormatResult<()> {
-        let ModModule {
-            range: _,
-            body,
-            type_ignores,
-        } = item;
-        // https://docs.python.org/3/library/ast.html#ast-helpers
-        debug_assert!(type_ignores.is_empty());
+        let ModModule { range: _, body } = item;
         write!(
             f,
             [