* fix: Do not add user to the top of queue after reject (fixes#4505)
Added a checkbox in the reject review dialog to ask whether user
wants to be added to the top of the queue or not. Default is off.
* Do not change request_assignment_next if wants_to_be_next is not True.
Set the request_assignment_next also in LeastRecentlyUsedReviewerQueuePolicy
so it can be used to override the assignment policy rules (i.e., if
someone has once per month, but he rejects review with wants_to_be_next set
to true, he will get new assignment immediately, not after one month).
* Added wants_to_be_next to test cases too.
* Fixed test function prototypes, they can't have any parameters, only
self. Added test cases for test_return_reviewer_to_rotation_top both
for RotateAlphabeticallyReviewerQueuePolicyTest and
LeastRecentlyUsedReviewerQueuePolicyTest.
d5bae45799