Fix: Use username instead of email

frontend/src/views/SecretApprovalPage/components/AccessApprovalPolicyList/components/AccessApprovalPolicyRow.tsx

@@ -98,7 +98,7 @@ export const AccessApprovalPolicyRow = ({
                   iconPos="right"
                   icon={isChecked && <FontAwesomeIcon icon={faCheckCircle} />}
                 >
-                  {user.email}
+                  {user.username}
                 </DropdownMenuItem>
               );
             })}