remove dashboard from @convex-dev/platform dependencies (#44209)

GitOrigin-RevId: d9de021da6692ebc942e19a520bfb624b66c7813

Author: reeceyang

npm-packages/@convex-dev/platform/package.json

@@ -22,7 +22,6 @@
     "typescript": "^5.9.2",
     "openapi-typescript": "~7.8.0",
     "openapi-typescript-helpers": "~0.0.15",
-    "dashboard": "workspace:*",
     "tsx": "^4.19.4",
     "zshy": "0.6.0"
   },