### What?
Stream S3 object directly to response instead of creating a Buffer in
memory and wire up an abort controller to stop streaming if user aborts
download
### Why?
To avoid excessive memory usage and to abort s3 download if user has
aborted the request anyway.
### How?
In node environment the AWS S3 always returns a Readable. The
streamToBuffer method always required this, but the any type hided that
this was actually needed. Now there is an explicit type check, but this
should never trigger in a node server environment.
Wire up and abort controller to the request so that we tell the S3
object to also stop streaming further if the user aborts.
Fixes#10286
Maybe also helps on other issues with s3 and resource usage
36fd6e905a