refactor: upgraded frontend-build to v12 & resolved eslint issues

Author: BilalQamar95

.eslintrc.js

@@ -1,3 +1,4 @@
+// eslint-disable-next-line import/no-extraneous-dependencies
 const { createConfig } = require('@edx/frontend-build');
 
 module.exports = createConfig('eslint');