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[ty] Disallow typing.TypedDict in type expressions (#19777)

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## Summary

Disallow `typing.TypedDict` in type expressions.

Related reference: https://github.com/python/mypy/issues/11030

## Test Plan

New Markdown tests, checked ecosystem and conformance test impact.
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David Peter 2025-08-06 15:58:35 +02:00 • committed by GitHub
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crates/ty_python_semantic/resources/mdtest/typed_dict.md
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@ -375,6 +375,17 @@ reveal_type(Message.__required_keys__) # revealed: @Todo(Support for `TypedDict
msg.content
```
## Error cases
### `typing.TypedDict` is not allowed in type expressions
```py
from typing import TypedDict
# error: [invalid-type-form] "The special form `typing.TypedDict` is not allowed in type expressions."
x: TypedDict = {"name": "Alice"}
```
## Diagnostics
<!-- snapshot-diagnostics -->