Allow opting out entity types and bundles from workflows

Merged into 2.x, thanks!

Re-opening this because there's yet a problem with excluding certain bundles or entire entity types from workflows via hook_entity_workflow_type_alter() and manipulating $configuration['entity_types'] to remove bundles or entire entity types from a workflow.

The problem seems to be that the RouteEnhancer is not really checking the possibly altered workflow config. In RouteEnhancer::enhance() the only check that happens is if a bundle/entity type is part of a workflow by calling EntityWorkflowInfo::getWorkflowsInfoForEntityTypeAndBundle() or EntityWorkflowInfo::getWorkflowsInfoForEntityType($entity_type_id). Thus, this code gets all bundles/entity types regardless of whether they are “altered out” via hook_entity_workflow_type_alter() or not.

To solve this we need to check the actual workflow configuration that is possibly altered. I'm not sure whether this should happen inside the route enhancer or not, but I'm adding it there for now. I can still move it if it makes more sense to have this inside EntityWorkflowInfo but as I'm not completely familiar with this module it could have unwanted side effects which I'm unaware of to add it there.

Merged the followup into 2.x, thanks!

Automatically closed - issue fixed for 2 weeks with no activity.