feat: Adds bulk_invite api for onboarding view (#8931)

- New API for bulk email invite

app/javascript/dashboard/api/agents.js

@@ -1,9 +1,17 @@
+/* global axios */
+
 import ApiClient from './ApiClient';
 
 class Agents extends ApiClient {
   constructor() {
     super('agents', { accountScoped: true });
   }
+
+  bulkInvite({ emails }) {
+    return axios.post(`${this.url}/bulk_create`, {
+      emails,
+    });
+  }
 }
 
 export default new Agents();