Remove some unused files from the repo (#5205)

- .devcontainer: we don't update it, we could keep it if we wanted
- .gitpod.yml: we don't need the .gitpod file, if someone uses gitpod they can install deps themself
- .helix: the config is out of date as it still uses prettier
- scripts/checkCpuModel.js: this script was used for benchmarks but we removed those
- scripts/generateMessage.js: this script was used for benchmarks but we removed those
- scripts/openApiSchema.js: this is a WIP script that was never finished and the discord open-api spec is preview
- .vscode/settings.json: the old tsdk config is deprecated, we now use the new js/ts.tsdk.path config instead

.vscode/settings.json

@@ -7,7 +7,7 @@
     "*.ts": "typescript",
     "*.js": "javascript"
   },
-  "typescript.tsdk": "node_modules/typescript/lib",
+  "js/ts.tsdk.path": "node_modules/typescript/lib",
   "[json]": {
     "editor.defaultFormatter": "biomejs.biome",
     "editor.quickSuggestions": {