chore(engine): refactor test assertion to ignore milliseconds

* The MySQL DueDate timestamp doesn't have millisecond accurracy, so current time comparisons fail.

Related to CAM-9924

engine/src/test/java/org/camunda/bpm/engine/test/bpmn/event/timer/BoundaryTimerNonInterruptingEventTest.java

@@ -635,6 +635,6 @@ public Void execute(CommandContext commandContext) {
     TimerEntity secondTimerJob = (TimerEntity) managementService.createJobQuery().singleResult();
     currentTime.add(Calendar.HOUR, 3);
     assertEquals("R3/PT3H", secondTimerJob.getRepeat());
-    assertEquals(currentTime.getTime(), secondTimerJob.getDuedate());
+    assertEquals(sdf.format(currentTime.getTime()), sdf.format(secondTimerJob.getDuedate()));
   }
 }