🚨(e2e) upgrade eslint to v9 with e2e app

We upgraded ESLint to version 9 in the e2e app,
which includes several improvements and fixes.
This change also involves updating the ESLint
configuration files to the new format and ensuring
compatibility with the latest ESLint features.

src/frontend/apps/e2e/__tests__/app-impress/utils-common.ts

@@ -27,7 +27,7 @@ export const CONFIG = {
 
 export const overrideConfig = async (
   page: Page,
-  newConfig: { [K in keyof typeof CONFIG]?: unknown },
+  newConfig: { [_K in keyof typeof CONFIG]?: unknown },
 ) =>
   await page.route('**/api/v1.0/config/', async (route) => {
     const request = route.request();