Add bulk actions for analytics' insights

Prerequisites (sorry in advance, this is long)
Run these steps before upgrading

1. Check out and install an earlier moodle version (e.g. 3.7)
2. Log in as admin
3. Enable 'enablecompletion' in site admin > advanced features
4. Setup your timezone correctly in site admin > location > location settings
5. Set up a course so that:
   • full & shortname: finished course
   • topics format
   • completion is enabled
   • startdate to right now (including hour and minute)
6. Enrol 2 users as students in the course
7. Enrol the logged in admin user as a teacher in the course
8. Create a page activity in a course section different than section 0
9. Log in as one of the students you enrolled (let's call him student1) and access the page activity
10. Set the course end date to right now
11. Click on the courses admin cog and select Course completion
12. Set Condition: Manual completion by others to Teacher role
13. Go to course admin > more... > reports > course completion
14. Flag student1 as approved (tick the box in the Approval column)
15. Run cron so that the course completion status of the student is updated
16. Go to site admin > development > make test course
17. Create a S size course with full and short name "ongoing course"
18. Go to the course and edit its settings so that:
    • topics format
    • completion is enabled
    • startdate to right now (including hour and minute)
    • enddate tomorrow or any date later than that
19. Enrol the logged in admin user as a teacher in the course
20. Create a page activity in a course section different than section 0
21. Click on the courses admin cog and select Course completion
22. Set Condition: Manual completion by others to Teacher role
23. Go to site admin > analytics > analytics settings and disable the 'onlycli' option
24. Go to site admin > analytics > analytics models
25. Click on new model > create model
26. Set the following values in the form:
    1. Tick 'enabled'
    2. Target: Students at risk of not meeting the course completion conditions
    3. Indicators: Page cognitive
    4. Time-splitting method: Single range
    5. Default value for predictions processor
    6. Save changes
27. Click on Actions > Execute scheduled analysis for the model you just created and click on continue once the analysis is finished
28. Open the JS console and set the inspector so that it stops on exceptions
    • On Firefox: Debugger > Breakpoints > Pause on exceptions
    • On Chrome: Sources tab > click "Pause on exceptions" (Make sure to leave "Pause on caught exceptions" unticked)
29. You should be now back in the analytics models page, you SHOULD see a dropdown menu in the insights column of the model you created above, select "ongoing course"
    • If you don't see the dropdown (it can happen randomly, this is fine) 'Actions > Clear predictions' and 'Actions > Execute scheduled analysis' again until you see it. If you don't see if after say... 5 tries check the 'Invalid analysables report' to confirm that the course you created is not invalid.
30. You SHOULD see a long list of students identified as at-risk
31. Select Actions > Not useful for one of the students
32. Upgrade moodle
33. Log in as admin and go to site admin > analytics > analytics models
34. Select ongoing course in the Insights column for the model you created before
35. You SHOULD see the following buttons on the top and bottom of the page:  Send message, Accept, Not applicable and Incorrectly flagged, they SHOULD be disabled by default
36. Check a couple of the checkboxes next to student names, now check the checkbox on the table header, it is a toggle for all the checkboxes below, check that it works as a usual toggle checkbox, leave it unchecked once done
37. Check two or three students (remember their names) and click on "Accept" on the top part of the page
38. You SHOULD see a confirmation message, confirm it, those students SHOULD NOT be there anymore
39. Reload the page, check that those students do not appear now
40. Check two or three students (remember their names) and click on "Incorrectly Flagged" on the bottom part of the page
41. You SHOULD see a confirmation message, confirm it, those students SHOULD NOT be there anymore
42. Reload the page, check that those students do not appear now
43. Check two or three students (remember their names) and click on "Not applicable" on the bottom part of the page
44. You SHOULD see a confirmation message, confirm it, those students SHOULD NOT be there anymore
45. Reload the page, check that those students do not appear now
46. Check two or three students (remember their names) and click on "Send message" on the top part of the page, write a message and press "Send message to N people"
47. You SHOULD see a notification on the top of the page: "Message sent to N people", the students SHOULD NOT be removed from the list of students and their checkboxes SHOULD remain checked
48. Go to site admin > analytics > analytics models and click on Actions > Effectiveness report (or Actions Insights report if MDL-66628 has been integrated)
49. There SHOULD NOT be any executed action with name Not useful