refactor: move backend in apps/backend

apps/backend/tests/Events/tasks/Unassign task to user.bru

@@ -0,0 +1,31 @@
+meta {
+  name: Unassign task to user
+  type: http
+  seq: 7
+}
+
+post {
+  url: {{url}}/api/events/task/unassign/{{id}}
+  body: json
+  auth: inherit
+}
+
+body:json {
+  {
+    "task_id": "{{task_id}}"
+  }
+}
+
+vars:pre-request {
+  id: 3
+  task_id: 2
+}
+
+assert {
+  res.status: eq 200
+}
+
+settings {
+  encodeUrl: true
+  timeout: 0
+}