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ce8f75f1 - Add `RegularCallableTypeOf` and `into_regular_callable` in `ty_extensions` (#23909)

Add `RegularCallableTypeOf` and `into_regular_callable` in `ty_extensions` (#23909) ## Summary fixes: https://github.com/astral-sh/ty/issues/3020 ## Test Plan Add a regression test case that currently fails on `main`.