build: Update ESLint to v9 (#16639)

packages/extensions/insights/eslint.config.mjs

@@ -0,0 +1,35 @@
+import { defineConfig, globalIgnores } from 'eslint/config';
+import { baseConfig } from '@n8n/eslint-config/base';
+
+export default defineConfig(
+	baseConfig,
+	globalIgnores(['src/shims.d.ts']),
+	{
+		rules: {
+			'unicorn/filename-case': ['error', { case: 'kebabCase' }],
+
+			// TODO: Remove these
+			'import-x/order': 'warn',
+			'import-x/no-default-export': 'warn',
+			'@typescript-eslint/no-unsafe-argument': 'warn',
+			'@typescript-eslint/no-unsafe-call': 'warn',
+			'@typescript-eslint/no-unsafe-member-access': 'warn',
+		},
+	},
+	{
+		files: ['src/backend/**/*.ts'],
+		languageOptions: {
+			parserOptions: {
+				project: ['./tsconfig.backend.json'],
+			},
+		},
+	},
+	{
+		files: ['src/frontend/**/*.ts'],
+		languageOptions: {
+			parserOptions: {
+				project: ['./tsconfig.frontend.json'],
+			},
+		},
+	},
+);