build: Update ESLint to v9 (#16639)

cypress/eslint.config.mjs

@@ -0,0 +1,39 @@
+import { defineConfig, globalIgnores } from 'eslint/config';
+import { baseConfig } from '@n8n/eslint-config/base';
+import cypressPlugin from 'eslint-plugin-cypress/flat';
+
+export default defineConfig(
+	globalIgnores(['scripts/**/*.js']),
+	baseConfig,
+	cypressPlugin.configs.recommended,
+	{
+		rules: {
+			// TODO: Remove this
+			'no-useless-escape': 'warn',
+			'import-x/order': 'warn',
+			'import-x/no-extraneous-dependencies': [
+				'error',
+				{
+					devDependencies: ['**/cypress/**'],
+					optionalDependencies: false,
+				},
+			],
+			'@typescript-eslint/naming-convention': 'warn',
+			'@typescript-eslint/no-explicit-any': 'warn',
+			'@typescript-eslint/no-unsafe-argument': 'warn',
+			'@typescript-eslint/no-unsafe-assignment': 'warn',
+			'@typescript-eslint/no-unsafe-call': 'warn',
+			'@typescript-eslint/no-unsafe-member-access': 'warn',
+			'@typescript-eslint/no-unsafe-return': 'warn',
+			'@typescript-eslint/no-unused-expressions': 'warn',
+			'@typescript-eslint/no-use-before-define': 'warn',
+			'@typescript-eslint/promise-function-async': 'warn',
+			'@typescript-eslint/prefer-nullish-coalescing': 'warn',
+			'@typescript-eslint/unbound-method': 'warn',
+			'cypress/no-assigning-return-values': 'warn',
+			'cypress/no-unnecessary-waiting': 'warn',
+			'cypress/unsafe-to-chain-command': 'warn',
+			'n8n-local-rules/no-uncaught-json-parse': 'warn',
+		},
+	},
+);