remove deprecated module pytensor.assert_op

pytensor/assert_op.py

-import warnings
-
-
-warnings.warn(
-    "The module `pytensor.assert_op` is deprecated "
-    "and its `Op`s have been moved to `pytensor.raise_op`",
-    DeprecationWarning,
-    stacklevel=2,
-)
-
-from pytensor.raise_op import Assert, assert_op  # noqa: F401 E402