Fix is_pep695 misidentifying Annotated[TypeAliasType] as PEP 695

Fix is_pep695 misidentifying Annotated[TypeAliasType] as PEP 695

The is_pep695() function incorrectly identified
Annotated[TypeAliasType, ...] as a PEP 695 type alias because
Annotated's __origin__ attribute returns the first type argument
(the TypeAliasType) rather than Annotated itself.  This caused
_init_column_for_annotation to crash with AttributeError when
attempting to access __value__ on the Annotated wrapper.

Added a check for is_pep593() before recursing through __origin__
in is_pep695(), so Annotated types are correctly excluded.

Fixes: #13386
Change-Id: I36ef83ebbab5abc08bed0131efb552c3fc001911