interfaces: mark `completelocalrepository` as a Protocol class This is just for completeness, since everything else in here is explicitly marked. The *.pyi file generated for this module is unchanged, because this class currently has no methods or attrs of its own (other than `__doc__`). With this, the odyssey of converting the zope interfaces to Protocol classes is complete. There's a little bit of mopping up in making sure the previously converted Protocols use `@abc.abstractmethod` where appropriate, but that can be deferred for now.