Emit cancellation event only when stream consumer is cancelled (backport #13092)

[mergify]

Not when the channel or the connection is closed.

References #13085, #9356

---

This is an automatic backport of pull request #13092 done by Mergify.

[mergify]

Cherry-pick of 69d0382 has failed:

On branch mergify/bp/v4.0.x/pr-13092
Your branch is up to date with 'origin/v4.0.x'.

You are currently cherry-picking commit 69d0382dd.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   deps/rabbit/src/rabbit_stream_queue.erl
	modified:   deps/rabbitmq_stream/src/rabbit_stream_metrics.erl

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   deps/rabbitmq_stream/src/rabbit_stream_reader.erl

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally