fix: return error response to avoid hanging

[ja-bravo]

This PR updates the access token endpoint so it returns when an error happens, closing the connection.

This fixes a crash when the end user takes a good while to fetch the credential after creating an offer, triggering a ERR_HTTP_HEADERS_SENT: Cannot set headers after they are sent to the client error.

We talked about this before and it was unclear if this change would break anything else but we've been running this successfully for months so I think it's okay.

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[TimoGlastra]

I think the issue with this approach is that the agent context session won't be closed correctly (which is why we call next().

I think we need to find out what is modifying the response after the error has been sent. Or allow returning early, but still having the afterware called