Add support for limited indexing

Problem to solve

Advanced search can be limited by namespace or project. WorkItems need to be indexed if the associated namespace or project is allowed to use advanced search

Proposal

Work items need to check both namespace and project (if there is a project) to see if the work item should be using advanced search or not. I think the namespace check can come first, but we also need to check project.

Ensure that the following workflows work:

settings	operation
group enabled for limiting	gitlab:elastic:index adds data to index
group enabled for limiting	gitlab:elastic:index_group_entities adds data to index
group enabled for limiting	remove group from limiting setting deletes data from index
group enabled for limiting	add group to limiting setting adds data to index
project enabled for limiting	gitlab:elastic:index adds data to index
project enabled for limiting	gitlab:elastic:index_projects adds data to index
project enabled for limiting	remove project from limiting setting deletes data from index
project enabled for limiting	add project to limiting setting adds data to index