Update Course Completion report to include more useful information

Enable course completion site-wide in advanced settings. Create a new course with completion enabled. Enrol multiple users in the course. Apply some criteria to the course view the Completion Tracking course settings page. Complete some of the criteria for various users (easiest way to do this is to use the Self Completion criteria and course block). View the completion course report. Expected: Report should look the same as before. When hovering over ticks it should show the time the user completed that criteria. Export links in footer should work, and exported reports should include times for each criteria completed. Exported reports should also contain a header row that matches the user data.