🚨 [Modern] QueryRenderer fetch operation throws uncaught error

It looks like in `1.5.0` (https://github.com/facebook/relay/commit/f76f12a56b2ed7486b8d4a0ce5d8efdf206c2b9a), `relay-runtime` introduced a (pretty major?) bug that manifests as an uncaught exception when handling any Query response that contains GraphQL errors.

```
RelayObservable.js:644 Uncaught Error: No data returned for operation `MyQuery`, got error(s):
HAHA!
```

The root cause looks to be that `normalizePayload` throws errors, and moving that call from the observable `map` call (which handles errors), to a sink (which doesn't handle errors) prevents relay from catching and handling those errors when thrown.