Remove Flaky StudentAdminTest test.

EDUCATOR-552

common/test/acceptance/tests/lms/test_lms_instructor_dashboard.py

@@ -1374,15 +1374,6 @@ class StudentAdminTest(BaseInstructorDashboardTest):
         self.username, _ = self.log_in_as_instructor()
         self.instructor_dashboard_page = self.visit_instructor_dashboard()
 
-    def test_rescore_nonrescorable(self):
-        student_admin_section = self.instructor_dashboard_page.select_student_admin(StudentSpecificAdmin)
-        student_admin_section.set_student_email_or_username(self.username)
-
-        # not a rescorable block
-        student_admin_section.set_problem_location(self.vertical.locator)
-        getattr(student_admin_section, 'rescore_button').click()
-        self.assertTrue(self.instructor_dashboard_page.is_rescore_unsupported_message_visible())
-
     def test_rescore_rescorable(self):
         student_admin_section = self.instructor_dashboard_page.select_student_admin(StudentSpecificAdmin)
         student_admin_section.set_student_email_or_username(self.username)