feat: allow overlapping assignments via flag set on individual teamers

src/Validator/Constraints/ApplicationValidator.php

@@ -19,6 +19,10 @@ class ApplicationValidator extends ConstraintValidator
 
         $teamer = $application->getTeamer();
 
+        if (true === $teamer->isAllowOverlappingApplications()) {
+            return;
+        }
+
         $assignment = $application->getAssignment();
         $destination = $assignment->getDestination();