Behat test to verify a teacher can select activities using the activity chooser (Automate MDLQA-2440)

The goal is to add a behat test to verify that a teacher can select activities using the activity chooser.

QA test to be automated: MDLQA-2440

QA testing instructions

Please test in more than one browser and mention in a comment which ones you've used.

1. Log in as a teacher, go to a course in topics course format, turn editing on and verify that you can see an 'Add an activity or resource' link in all course sections.
2. Click the link and verify that a modal window opens displaying activities and resources.
3. Verify that you can navigate through the activities and resources using the keyboard tab and arrow keys.
4. Verify that you can close the window by clicking the x or pressing escape.
5. Verify that you can view the information about an activity or resource by clicking the 'i' icon.
6. When viewing this information, verify that there is a 'More help' link which opens Moodle Docs in a new window.
7. Verify that when the 'Add' button is clicked that you are taken to the adding a new activity page.
8. Verify that you can also click an activity name to be taken to the adding a new activity page.
9. Repeat steps 1 to 8 with the course in weekly course format.