fix(ci): add missing eslint/prettier/typescript devDeps

Add eslint@^8.57.0, @headlamp-k8s/eslint-config@^0.6.0, prettier@^2.8.8,
typescript@~5.6.2 as explicit devDependencies. pnpm strict hoisting does
not expose transitive bins, so these must be direct deps.

package.json

@@ -33,6 +33,7 @@
     "undici": "^7.24.3"
   },
   "devDependencies": {
+    "@headlamp-k8s/eslint-config": "^0.6.0",
     "@kinvolk/headlamp-plugin": "^0.13.0",
     "@mui/material": "^5.15.14",
     "@testing-library/jest-dom": "^6.4.8",
@@ -40,11 +41,14 @@
     "@testing-library/user-event": "^14.5.2",
     "@types/react": "^18.0.0",
     "@types/react-dom": "^18.0.0",
+    "eslint": "^8.57.0",
     "jsdom": "^24.0.0",
     "notistack": "^3.0.0",
+    "prettier": "^2.8.8",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "react-router-dom": "^5.3.0",
+    "typescript": "~5.6.2",
     "vitest": "^3.2.4"
   }
 }