Allow feedback to be flagged

What does this mr do?

TA's are able to flag feedback for inappropriate texts. When feedback has been flagged, this will show to anyone who can view the de-anonimised feedback.

Screenshots

note: The (i) is hoverable and tells the user the feedback is reported.

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 #677

src/main/java/nl/tudelft/queue/controller/HomeController.java

@@ -58,6 +58,7 @@ import nl.tudelft.queue.service.EditionService;
 import nl.tudelft.queue.service.FeedbackService;
 import nl.tudelft.queue.service.LabService;
 import nl.tudelft.queue.service.PermissionService;
+import org.springframework.web.bind.annotation.RequestParam;
 
 @Controller
 public class HomeController {
@@ -290,6 +291,17 @@ public class HomeController {
 		return "home/feedback";
 	}
 
+	@GetMapping("/feedback/{id}/report")
+	@PreAuthorize("@permissionService.canViewFeedback(#id)")
+	public String reportFeedback(@RequestParam Long request, @RequestParam Long assistant,
+								 @RequestParam String callback, @PathVariable String id) {
+		System.out.printf("Report for request %s for assistant %s", request,
+				assistant);
+		fs.reportFeedback(new Feedback.Id(request, assistant));
+		return "redirect:" + callback + "?success";
+
+	}
+
 	/**
 	 * Fills in the model for a page where feedback is shown to the user.
 	 *