Issue #2977140: Deprecate entity_type in route provider

Danil Veselovrequested to merge
issue/drupal-2977140:2977140-deprecated-pointless-parameter into main

Store the entity type in each provider at construction. Deprecate the $entity_type parameter on EntityRouteProviderInterface::getRoutes() and all implementations; update EntityRouteProviderSubscriber to call getRoutes() without arguments.

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