Fix #32574: Handle callable objects with custom __signature__ in get_type_hints

[Jongwan93]

Summary

Fixes #32574

This PR fixes an issue where get_type_hints() incorrectly handled callable objects with custom __signature__ attributes. Previously, these objects would fail with a TypeError because typing.get_type_hints() cannot introspect arbitrary callable instances.

Problem

When a callable object defines a custom __signature__ attribute, the existing implementation would pass the callable instance itself to typing.get_type_hints().

This broke use cases where wrappers need to preserve type information from wrapped functions by setting __signature__.

Solution

Modified get_type_hints() in decorator_utils.py to:

1. Check for __signature__ attribute first (highest priority).
2. Extract type hints directly from the signature object instead of calling typing.get_type_hints().
3. Properly handle parameters and return annotations from the signature.

Changes

• Modified python_modules/dagster/dagster/_core/decorator_utils.py:
  • Updated get_type_hints() to extract annotations directly from __signature__ when present
• Added test in python_modules/dagster/dagster_tests/definitions_tests/test_sensor_invocation.py:
  • test_sensor_invocation_resources_callable_with_custom_signature()

Testing

• New test test_sensor_invocation_resources_callable_with_custom_signature passes
• All existing test_sensor_invocation.py tests pass
• Verified backward compatibility with existing callable object handling

[MiniaczQ]

lgtm