Resolve "Shared Lab fixes"

What does this mr do?

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 #549 (closed)

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

@@ -37,6 +37,7 @@ import nl.tudelft.queue.repository.LabRepository;
 import nl.tudelft.queue.service.LabService;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Lazy;
 import org.springframework.security.access.prepost.PreAuthorize;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
@@ -66,6 +67,7 @@ public class AdminController {
 	private LabRepository labRepository;
 
 	@Autowired
+	@Lazy
 	private LabService ls;
 
 	@Autowired