Fix HttpRequestInfo::upload_data_stream dangling pointer, try 2.

HttpStreamFactory::Jobs and HttpStreamFactory::Controllers keep pointers
to HttpRequestInfos. These jobs can outlive the parent request when
they're orphaned (That is, when we keep an HTTP/3 Job around after we
have an HTTP/2 connection, so we'll have an HTTP/3 connection available
if there's a new request that can use one down the line).

That causes the `upload_data_stream` to dangle, if we orphan a job
when there's an upload body. To fix this, create a new
HttpStreamFactory::StreamRequestInfo structure, which is just the
portion of HttpRequestInfo that's needed by the stream layer, and
create copies of that instead for the ::Job and ::Controller. This
also saves a bit of memory, since we're no longer needlessly creating
copies of the request headers, among other fields.

Bug: 40212619
Change-Id: I4594c5517e565efed92f241a5bb1a0dce6777008
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5420153
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Commit-Queue: mmenke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1282241}