questions_in_use should work with any plugin, not just mods

Core regression detect

1. Create a question in the question bank (e.g. Truefalse).
2. Create a quiz.
3. Add the question you created to the quiz.
4. In the question bank, select the option to delete the question.
5. Verify that in the confirm dialoge, the question name has a * next to it, to indicate that the question is in use.

Using 3rd part plugins (preparations)

1. Install these plugins form github, by executing from your moodle root directory:

   git clone https://github.com/moodleou/moodle-filter_embedquestion.git filter/embedquestion/

   git clone https://github.com/moodleou/moodle-report_embedquestion.git report/embedquestion/

   git clone https://github.com/moodleou/moodle-atto_embedquestion.git lib/editor/atto/plugins/embedquestion/

2. Upgrade your site to get the plugins installed.
3. Enable the "Embed questions" filter @ Admin->Manage filters
4. Add the "embedquestion" atto plugin to the Atto Toolbar config (admin->editors->atto editor->toolbar settings). Surely to the "files" group, after "h5p". Save changes.

Using 3rd part plugins (automated)

1. Find the line in report/embedquestion/tests/lib_test.php that says $this->markTestSkipped('This test cannot pass until MDL-67947 has been integrated. Skipping.'); and delete it.
2. Verify that the report_embedquestion PHPunit tests pass. (--testsuite report_embedquestion_testsuite). Expected result:

   Tests: 41, Assertions: 87, Skipped: 2.

Using 3rd part plugins (manual)

1. Create a course
2. Create a category in the question bank with an idnumber.
3. Create a new truefalse question in that category of the question bank, also with an idnumber.
4. Create a page with the truefalse question embedded in it.
5. View the page, so you have started an attempt at the question.
6. Go to the question bank, and delete the question.
7. Verify that in the confirm dialoge, the question name has a * next to it, to indicate that the question is in use.