TSK-1145: enabled validateThrows property for JavadocMethod.checkstyle and added missing throws javadoc

qa/checkstyle/checkstyle.xml

@@ -253,6 +253,7 @@
     </module>
     <module name="JavadocMethod">
       <property name="scope" value="public"/>
+      <property name="validateThrows" value="true"/>
       <property name="allowMissingParamTags" value="true"/>
       <property name="allowMissingReturnTag" value="true"/>
       <property name="allowedAnnotations" value="Override, Test"/>

rest/taskana-rest-spring/src/main/java/pro/taskana/rest/WorkbasketDefinitionController.java

@@ -106,6 +106,7 @@ public class WorkbasketDefinitionController {
    *     incorrect.
    * @throws WorkbasketAccessItemAlreadyExistException if a WorkbasketAccessItem for the same
    *     workbasket and access_id already exists.
+   * @throws ConcurrencyException if workbasket was updated by an other user
    */
   @PostMapping(path = Mapping.URL_WORKBASKETDEFIITIONS)
   @Transactional(rollbackFor = Exception.class)