Refactor/new menu item (#1448)

* wip

* finished

* Added disabled

* Fixed disabled

* Finished cleaning

* Minor fixes from merge

* Added docs

* Added PascalCase

* Fix from review

* Fixes from merge

* Fix lint

* Fixed storybook tests

front/src/pages/tasks/tasks-filters.tsx

@@ -8,7 +8,7 @@ export const tasksFilters: FilterDefinitionByEntity<Activity>[] = [
   {
     key: 'assigneeId',
     label: 'Assignee',
-    icon: <IconUser />,
+    Icon: IconUser,
     type: 'entity',
     entitySelectComponent: (
       <FilterDropdownUserSearchSelect context={TasksRecoilScopeContext} />