prevent race condition/remove duplicate coverage

Added a `skipif` conditional:
* a race condition with test_edit_profile_has_proper_display_name() and test_edit_profile_change_display_name() can occur when run against `dev/stage`
* test_edit_profile_change_display_name() is destructive and can only be run again `dev/stage`
* test_edit_profile_has_proper_display_name() provides coverage that we want on `prod`