R1:0c7ea8c94215

When users fail a "CAN_SEE" check, give them an "opaque" policy explanation

Summary:
Ref T13411. Currently, if you hit a policy exception because you can't view an object, we disclose details about the view policy of the object, particularly which project's members can see the object for project policies.

Although there's a large amount of grey area here, this feels like a more substantial disclosure than we offer in other contexts. Instead, if you encounter a policy exception while testing "CAN_VIEW" or…