RequestManager + Fetch fails on HEAD calls

[Windvis]

Steps to reproduce:

const manager = new RequestManager().use([Fetch]);
await manager.request({ 'some-url', method: 'HEAD' });

After the response succeeds, the Fetch handler throws an error on this line, because HEAD requests have no body:

warp-drive/warp-drive-packages/core/src/request/-private/fetch.ts

Line 164 in c4afcad

const reader = response.body!.getReader();

Error message:

TypeError: can't access property "getReader", response.body is null

[Windvis]

Resolved by #10463