Delete type-ignore node

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## 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.

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## Test Plan

`cargo build`

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crates/ruff_python_parser/src/snapshots/ruff_python_parser__parser__tests__jupyter_magic.snap

@@ -347,6 +347,5 @@ Module(
                 },
             ),
         ],
-        type_ignores: [],
     },
 )