refactor(core): Introduce overload for record-type node parameter (no-changelog) (#4648)

* 📘 Set up overload

* 🔥 Remove inferrable record assertions

* 👕 Fix semicolon

* 👕 Fix another semicolon

packages/nodes-base/nodes/Mattermost/v1/actions/user/create/execute.ts

@@ -10,7 +10,7 @@ export async function create(
 ): Promise<INodeExecutionData[]> {
 	const username = this.getNodeParameter('username', index) as string;
 	const authService = this.getNodeParameter('authService', index) as string;
-	const additionalFields = this.getNodeParameter('additionalFields', index) as IDataObject;
+	const additionalFields = this.getNodeParameter('additionalFields', index);
 
 	const qs = {} as IDataObject;
 	const requestMethod = 'POST';