Random lesson completion behat failure (take#2)

In MDL-72698 it was fixed a random on lesson behat tests. The fix was for the:

lesson_activity_completion.feature => View automatic completion items as a student

scenario.

It has been detected that there is a very similar scenario, failing similarly to the above one at:

lesson_completion_pass_grade.feature => View automatic completion items as a student

This issue is to compare both scenarios and decide:

1) If the laster can be removed or reduced to really just check for grades stuff.
2) If the same solution that was applied to the former (and is working ok) can be applied also here.

Link to one of the failures: https://ci.moodle.org/job/W.02.05%20-%20Behat%20-%20Goutte%20+%20Oracle/1667/

Ciao