apply _propagate_attrs in _construct_for_list

apply _propagate_attrs in _construct_for_list

Fixed issue where the "is ORM" flag of a :func:`.select` or other ORM
statement would not be propagated to the ORM :class:`.Session` based on a
multi-part operator expression alone, e.g. such as ``Cls.attr + Cls.attr +
Cls.attr`` or similar, leading to ORM behaviors not taking place for such
statements.

Fixes: #12357
Change-Id: I61130eeb3c7a32c1830731fd9ad4eb99a64abf7d