fix: Sync Docker system monitor events

[HofmeisterAn]

What does this PR do?

Synchronizes the Docker system event tests with the help of AutoResetEvent. At least two tests (MonitorEventsAsync_IsCancelled_NoStreamCorruption and MonitorEventsFiltered_Succeeds) do not synchronize the events. The tests are not deterministic, they might run into a race condition where events are not published on assertions yet.

Why is it important?

Some Docker.DotNet tests are flaky, PR improves the reliability of the tests.

Related issues

• Relates Update ISystemOperations.cs to give proper warning for MonitorEventsAsync #599

Follow-ups

• Looking closer into the tests, I noticed (gut feeling) events triggered, quickly after another might not be published reliable. It looks like they are swallowed.
• I think we can reduce the complexity of StreamUtil.
• /cc @dgvives You might want to take a look at the stream corruption test changes.

[dgvives]

@HofmeisterAn the stream corruption tests come from #375, I didn't run into this problem myself but I was able to replicate it using that piece of code.
I would say tests are good if no stream corruption happens

[HofmeisterAn]

@HofmeisterAn the stream corruption tests come from #375, I didn't run into this problem myself but I was able to replicate it using that piece of code. I would say tests are good if no stream corruption happens

I noticed that the events are not published reliable and fixed them too. If you e.g. look at the other PR's build (ff.) you see no event or message output. I got them sometimes on my local runs though.

[HofmeisterAn]

@galvesribeiro can you please take a look into this PR? I would like to work on some follow-ups.

[HofmeisterAn]

@galvesribeiro can you please review the PR?