ESLint: Set no-unused-vars rule to error

This rule should output error instead of just a warning.

src/Components/CloudProviderConfig/AWSConfig.tsx

@@ -1,4 +1,4 @@
-import React, { useEffect, useState } from 'react';
+import React from 'react';
 
 import {
   Button,

src/test/mocks/cockpit/cockpitFile.ts

@@ -31,7 +31,7 @@ export const getLastBlueprintReq = () => {
   return lastRequest.blueprints[lastRequest.blueprints.length - 1];
 };
 
-export const cockpitFile = (filepath: string, options?: object) => {
+export const cockpitFile = (filepath: string, _options?: object) => {
   return {
     read: (): Promise<string> => {
       const file = path.parse(filepath);