course_enrolment_manager method should not always do a count_records and a get_records

  For the Enrol users popup when clicking on Enrol users button on Participants page, the functionality should not have changed at all. The existing the new Unit Test of Enroll should provide reasonable coverage.   For the Search popup when clicking on Assign roles button on Other users page: Login as admin Change theme to Clean theme (Because Boost theme do not use this any more) Open your browser's dev tools and in the network tab (chrome and firefox have this) Create 1 user. Go to Other user page of Course (Ex: enrol/otherusers.php?id= [courseid] Click on Assign roles button Verify that the popup will show 1 user found Verify in the browser's dev tools that moreuser value in the response data is false and totalusers value does not exist in the response data Create 20 users more. Click on Assign roles button Verify that the popup will show 21 users found Verify in the browser's dev tools that moreuser value in the response data is false Create 10 users more. Click on Assign roles button Verify that the popup will show More than 25 users found (With 25 is the default paging number) Verify in the browser's dev tools that moreuser value in the response data is true