Search results do not acknowledge workspace roles

[scruwys]

Bug Report

Search results currently do not honor role-based permissions, such as the Owner role.

Have you read the Contributing Guidelines on issues?

Yes

Actual Behavior

If John Doe is an owner of a workspace, he would have access to the Postgres datastore. If object-level permissions are enabled and he is not explicitly granted the view_datastore permission, the Postgres datastore will not appear in the search results.

This should be a pretty quick fix in the elastic_backend.py if we just allow all datastores within a workspace if the requesting user is an owner.