By @gomoripeti: Streams: two additional Prometheus metrics for connections (backport #12765)

[mergify]

This is #10275 by @gomoripeti re-submitted so that Actions have access to all the GH secrets.

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This is an automatic backport of pull request #12765 done by Mergify.

[mergify]

Cherry-pick of 9bb7530 has failed:

On branch mergify/bp/v4.0.x/pr-12765
Your branch is up to date with 'origin/v4.0.x'.

You are currently cherry-picking commit 9bb7530d04.
  (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:
	new file:   deps/rabbitmq_ct_helpers/src/stream_test_utils.erl

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   deps/rabbitmq_ct_helpers/Makefile
	both modified:   deps/rabbitmq_stream/test/protocol_interop_SUITE.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