Create unassignUser, unassignSelf methods and Bruno requests. Add call events when needed

tests/Events/tasks/Unassign task.bru

@@ -0,0 +1,26 @@
+meta {
+  name: Unassign task
+  type: http
+  seq: 6
+}
+
+post {
+  url: {{url}}/api/events/task/unassign
+  body: json
+  auth: inherit
+}
+
+body:json {
+  {
+    "task_id": "{{taskId}}"
+  }
+}
+
+vars:pre-request {
+  taskId: 
+}
+
+settings {
+  encodeUrl: true
+  timeout: 0
+}