Always show node_modules inside test in VS Code (#40956)

As per #40926 we commit all node_modules inside test so we can test external packages. It will be much more convenient to not hide them in VS Code. With this configuration, all node_modules folders will be excluded except for these under the test directory.

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have a helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have a helpful link attached, see `contributing.md`

## Documentation / Examples

- [ ] Make sure the linting passes by running `pnpm lint`
- [ ] The "examples guidelines" are followed from [our contributing doc](https://github.com/vercel/next.js/blob/canary/contributing/examples/adding-examples.md)

.vscode/settings.json

@@ -5,5 +5,10 @@
     { "language": "typescript", "autoFix": true },
     { "language": "typescriptreact", "autoFix": true }
   ],
-  "debug.javascript.unmapMissingSources": true
+  "debug.javascript.unmapMissingSources": true,
+  "files.exclude": {
+    "**/node_modules": false,
+    "node_modules": true,
+    "*[!test]**/node_modules": true
+  }
 }