MDL-72698 behat: Reduce random lesson behat failures on slow envs

In very slow environments viewing the lesson page for a student takes
more than 1 second and, because of this, the "Spend at least 1 sec"
completion condition is considered done.

So, in order to alleviate this problem, that leads to random failures
in CIs with slow databases, we have changed the condition to be 3
seconds instead.

That seems to do the work in super-slow environments, with 100
executions passing ok (when previously the scenario was failing 33%
of times).

The only cost is that now the behat run will be 2 seconds slower (there
is a wait changed from 2 to 4 seconds), but that's an acceptable
price to pay to get the scenarios consistent passing.

See the issue for more details.

mod/lesson/tests/behat/lesson_activity_completion.feature

@@ -27,7 +27,7 @@ Feature: View activity completion in the lesson activity
       | completionusegrade         | 1             |
       | completionendreached       | 1             |
       | completiontimespentenabled | 1             |
-      | completiontimespent        | 1             |
+      | completiontimespent        | 3             |
     And I am on the "Music history" "lesson activity" page logged in as teacher1
     And I follow "Add a content page"
     And I set the following fields to these values:
@@ -49,28 +49,28 @@ Feature: View activity completion in the lesson activity
   Scenario: View automatic completion items as a teacher
     When I am on the "Music history" "lesson activity" page logged in as teacher1
     Then "Music history" should have the "View" completion condition
-    And "Music history" should have the "Spend at least 1 sec on this activity" completion condition
+    And "Music history" should have the "Spend at least 3 secs on this activity" completion condition
     And "Music history" should have the "Go through the activity to the end" completion condition
     And "Music history" should have the "Receive a grade" completion condition
 
   Scenario: View automatic completion items as a student
     Given I am on the "Music history" "lesson activity" page logged in as student1
     And the "View" completion condition of "Music history" is displayed as "done"
-    And the "Spend at least 1 sec on this activity" completion condition of "Music history" is displayed as "todo"
+    And the "Spend at least 3 secs on this activity" completion condition of "Music history" is displayed as "todo"
     And the "Go through the activity to the end" completion condition of "Music history" is displayed as "todo"
     And the "Receive a grade" completion condition of "Music history" is displayed as "todo"
     When I am on the "Music history" "lesson activity" page
-    And I wait "2" seconds
+    And I wait "4" seconds
     And I reload the page
     And the "View" completion condition of "Music history" is displayed as "done"
-    And the "Spend at least 1 sec on this activity" completion condition of "Music history" is displayed as "done"
+    And the "Spend at least 3 secs on this activity" completion condition of "Music history" is displayed as "done"
     And the "Go through the activity to the end" completion condition of "Music history" is displayed as "todo"
     And the "Receive a grade" completion condition of "Music history" is displayed as "todo"
     And I press "The history of music part 1"
     And I set the field "Your answer" to "Some drummers play with their sticks flipped around"
     And I press "Submit"
     Then the "View" completion condition of "Music history" is displayed as "done"
-    And the "Spend at least 1 sec on this activity" completion condition of "Music history" is displayed as "done"
+    And the "Spend at least 3 secs on this activity" completion condition of "Music history" is displayed as "done"
     And the "Go through the activity to the end" completion condition of "Music history" is displayed as "done"
     And the "Receive a grade" completion condition of "Music history" is displayed as "done"