refactor(core): Update rule typescript-eslint/no-unused-vars to not error when variable starts with _ (#4523)

* ⚡ rule and fixes

* ⚡ clean up

packages/nodes-base/nodes/Pushover/GenericFunctions.ts

@@ -1,5 +1,3 @@
-import { OptionsWithUri } from 'request';
-
 import { IExecuteFunctions, IExecuteSingleFunctions, ILoadOptionsFunctions } from 'n8n-core';
 
 import { IDataObject, IHttpRequestMethods, IHttpRequestOptions, NodeApiError } from 'n8n-workflow';
@@ -11,7 +9,7 @@ export async function pushoverApiRequest(
 	// tslint:disable-next-line:no-any
 	body: any = {},
 	qs: IDataObject = {},
-	option = {},
+	_option = {},
 	// tslint:disable-next-line:no-any
 ): Promise<any> {
 	const options: IHttpRequestOptions = {

packages/nodes-base/nodes/Pushover/Pushover.node.ts

@@ -301,7 +301,6 @@ export class Pushover implements INodeType {
 		const items = this.getInputData();
 		const returnData: IDataObject[] = [];
 		const length = items.length;
-		const qs: IDataObject = {};
 		let responseData;
 		const resource = this.getNodeParameter('resource', 0) as string;
 		const operation = this.getNodeParameter('operation', 0) as string;