N818 ErrorSuffixOnExceptionName should apply recursively to sub-subclasses of Exception

[andersk]

This triggers N818 exception name 'Bar' should be named with an Error suffix in pep8-naming but not in Ruff:

class FooError(Exception):
    pass

class Bar(FooError):
    pass

pep8-naming checks this by recursively searching all ancestor classes, although it may be nearly as effective to just check whether an immediate parent class has a name ending in Error.

[charliermarsh]

Yeah let's do the latter for now (checking parent names) as a heuristic.