chore: remove VS Code settings that are not needed

- eslint setting is deprecated
- instanceUrl setting is not needed thanks to our heuristic for
guessing the instanceUrl from git remote

.vscode/settings.json

 {
-  "javascript.validate.enable": false,
-  "eslint.enable": true,
-  "gitlab.instanceUrl": "https://gitlab.com"
+  "javascript.validate.enable": false
 }