fix: generalise permission check for query user information (#8458)

# Which Problems Are Solved

IDPLinks list and other list endpoints can provide you with empty
results if the used user has no permission for the information.

# How the Problems Are Solved

List endpoints with subelements to users, and provided userIDQuery, will
return a PermissionDenied error if no permission for the user exsists.

# Additional Changes

Function to check for permission is re-used from the GetUserByID.

# Additional Context

Closes #8451

internal/api/grpc/auth/idp.go

@@ -13,7 +13,7 @@ func (s *Server) ListMyLinkedIDPs(ctx context.Context, req *auth_pb.ListMyLinked
 	if err != nil {
 		return nil, err
 	}
-	links, err := s.query.IDPUserLinks(ctx, q, false)
+	links, err := s.query.IDPUserLinks(ctx, q, nil)
 	if err != nil {
 		return nil, err
 	}