Resolve "[Queue-2.0] Exam: More visually display percentage covered"

What does this mr do?

Add a progress indicator to show the number of handled requests.

Screenshots

before

after

Does this MR meet the acceptance criteria?

• I have added a changelog entry to reflect the significant changes I made.
• Tests were created to test the feature.
• I have updated the documentation accordingly.
• I adhere to the style guide. Closes #413 (closed)

src/main/java/nl/tudelft/queue/dto/view/labs/ExamLabViewDTO.java

@@ -47,6 +47,10 @@ public class ExamLabViewDTO extends AbstractSlottedLabViewDTO<ExamLab> {
 
 	private List<Page<ExamTimeSlotViewDTO>> timeSlotPages;
 
+	private int totalHandled;
+	private int totalNeeded;
+	private int percentageHandled;
+
 	@Override
 	public void postApply() {
 		super.postApply();
@@ -61,6 +65,11 @@ public class ExamLabViewDTO extends AbstractSlottedLabViewDTO<ExamLab> {
 				.map(e -> new PageImpl<>(e.getValue(), PageRequest.of(e.getKey(), pages),
 						data.getTimeSlots().size()))
 				.collect(Collectors.toList());
+		totalHandled = data.getHandled().size();
+		totalNeeded = (int) Math
+				.ceil(data.getRequests().size() * ((double) examLabConfig.getPercentage() / 100.0));
+		percentageHandled = totalNeeded == 0 ? 0
+				: (int) (((double) totalHandled / (double) totalNeeded) * 100);
 	}
 
 	/**