Refactoring & Feature: edit/delete controls of tasks (#11357)

* 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

website/client/components/challenges/challengeDetail.vue

@@ -57,7 +57,7 @@
         :type="column",
         :key="column",
         :taskListOverride='tasksByType[column]',
-        :showOptions="showOptions",
+        :challenge="challenge"
         @editTask="editTask",
         @taskDestroyed="taskDestroyed",
         v-if='tasksByType[column].length > 0')
@@ -252,9 +252,6 @@ export default {
     canJoin () {
       return !this.isMember;
     },
-    showOptions () {
-      return this.isLeader;
-    },
   },
   mounted () {
     if (!this.searchId) this.searchId = this.challengeId;