Refactoring & Fix: editing group and challenges from user dashboard (#11418)

* Refactoring & Feature: edit/delete group and challenge tasks

- Remove showOption from tasks props
- Pass all needed data to task for understand in mapGetter function which controls we should show
- Improve current solution with edit and delete logic

* Fix: this in template

* Fix & Test: extend tests, fix can Edit/Delete functions

* Fix: allow user edit challenge tasks on dashboard

* Fix: test case after code change

* fix import path

* Fix:

- Extend canEdit and canDelete functions with admin role
- Clarify canEdit and canDelete conditions
- Extend test cases

website/client/src/components/challenges/challengeDetail.vue

@@ -123,7 +123,7 @@
           class="col-12 col-sm-6"
           :type="column"
           :task-list-override="tasksByType[column]"
-          :show-options="showOptions"
+          :challenge="challenge"
           @editTask="editTask"
           @taskDestroyed="taskDestroyed"
         />
@@ -386,9 +386,6 @@ export default {
     canJoin () {
       return !this.isMember;
     },
-    showOptions () {
-      return this.isLeader;
-    },
   },
   mounted () {
     if (!this.searchId) this.searchId = this.challengeId;