Sabrecat/groups quick wins (#11146)

* WIP(groups): quickish wins

* WIP(groups): two quick wins
1. Don't show task creation button if user is not leader or manager
2. Don't require JS confirm() for approving tasks

* fix(group-plans): allow delete from options button

* fix(group-plans): update tasksOrder when task deleted

* fix(group-tasks): dismiss notification when user takes action

* refactor(tasks): DRY out create button styling

* fix(group-tasks): sync after claiming/unclaiming

* fix(claiming): better sync and notif handling

* fix(tasks): force sync instead of explicitly clearing notif

* fix(tasks): reposition task creation button

* fix(group-tasks): default to single completion

* fix(group-tasks): move completion condition field above approval switch

* fix(group-tasks): todo validation error and approval notif dismissal

* fix(group-tasks): default single completion on client

* fix(group-tasks): move completion condition up more

* fix(group-tasks): maintain client-side user assignment list

* fix(group-tasks): remove approval notifications when task deleted

* fix(group-tasks): send assigned task to top of task list

* fix(group-tasks): remove useless tag filter dropdown

* feat(group-tasks): notify user of assigned task

* fix(group-tasks): don't allow approval of tasks w/ no approval request

* fix(tests): adjust expectations

* fix(group-tasks): more sensible action on assignment notif click

website/client/components/header/notifications/groupTaskAssigned.vue

@@ -0,0 +1,26 @@
+<template lang="pug">
+  base-notification(
+    :can-remove="canRemove",
+    :has-icon="false",
+    :notification="notification",
+    :read-after-click="true",
+    @click="action",
+  )
+    div(slot="content", v-html="notification.data.message")
+</template>
+
+<script>
+  import BaseNotification from './base';
+
+  export default {
+    props: ['notification', 'canRemove'],
+    components: {
+      BaseNotification,
+    },
+    methods: {
+      action () {
+        this.$router.push({ name: 'tasks'});
+      },
+    },
+  };
+</script>