test: add page permission tests and ConnCase role tags

- ConnCase: add :read_only and :normal_user role tags for tests.
- Add CheckPagePermission plug tests (unit + integration for member, read_only,
  normal_user, admin). Update permission_sets_test (refute "/" for own_data).
- Profile navigation, global_settings, role_live, membership_fee_type: use
  users with role for "/" access; expect redirect for own_data on /settings
  and /admin/roles.

test/mv/authorization/permission_sets_test.exs

@@ -127,7 +127,8 @@ defmodule Mv.Authorization.PermissionSetsTest do
     test "includes correct pages" do
       permissions = PermissionSets.get_permissions(:own_data)
 
-      assert "/" in permissions.pages
+      # Root "/" is not allowed for own_data (Mitglied is redirected to profile)
+      refute "/" in permissions.pages
       assert "/profile" in permissions.pages
       assert "/members/:id" in permissions.pages
     end