Course Completion requests for each course won't be necessary anymore

This needs to be tested in a Moodle with master branch. In the app, login as a student. Open the Network tab in the developer tools and clear them. Perform a PTR in the dashboard. Check that there are no WS calls to core_completion_get_course_completion_status. Now open any course. Check that there are no WS calls to core_completion_get_course_completion_status. Go to participants and open your profile. Check that there are no WS calls to core_completion_get_course_completion_status. Now open another user profile. Check that there is a WS call to core_completion_get_course_completion_status (we don't know if the user has permissions to see the other user completion).