fix(sb_workers): don't propagate promise rejection on request body streaming failure

[nyannyacha]

What kind of change does this PR introduce?

Bug fix

Description

For a promise to a WritableStream that streams the body of an inbound request to a user worker, the promise might be rejected in some cases.

Previously, if this promise was rejected, an exception to this rejection would be propagated to the caller.

let [sent, res] = await Promise.allSettled([reqBodyPromise, resPromise]);

The promise res, which gets the response from the user worker, and the promise sent, which streams the request body to the user worker, are bound by Promise.allSettled, so it will not return until all of the passed Promises have performed their actions.

However, propagating exceptions for these sent is turns out to be undesirable.

This is because the user worker may consume the request object abnormally, or op_user_worker_fetch_send may drop the channel object in the body under the request object, causing the promise to be rejected.

Therefore, we should always expose only the result for res to the caller.

Fixes #366

[laktek]

LGTM! should we add a test for this?

[github-actions]

🎉 This PR is included in version 1.54.7 🎉

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