PollNetMapStream: do not create any rows during long-poll operation

[enoperm]

• read the CONTRIBUTING guidelines
• raised a GitHub issue or discussed it on the projects chat beforehand - found existing issues.
• added unit tests - testing requires a client, currently only available in integration tests.
• ] added integration tests
• updated documentation if needed - PR contains changes without changes to expected behaviour towards clients or users.
• updated CHANGELOG.md

Fixes #232 (manually tested in the no-preauthkeys case)
Related to #93

[juanfont]

This looks good to me. @kradalby what is your opinion?

[kradalby]

Yep I'm happy to have this, @enoperm do you think it is suitable for merge?

[enoperm]

Sorry, haven't had the time to finish up the MR the way I wanted last week. That said, I have thought a bit about it, and ultimately decided I'd rather not add a deployment test for this specific issue unless requested - the original problem looks implementation specific, and unlikely to re-emerge in the future, so long as GORM or ${insert future data storage layer} is used as intended. It sounds a bit like a waste to prolong every CI run by minutes for it.

The changes are not so large that I see it as a requirement of not breaking things, either.

[enoperm]

I seem to have messed up a bit when I first tried to merge the current main. so ended up rebase-ing and force pushing. I kindly request a re-review so as to make sure nothing weird happened that I have not noticed, but other than that, it should be okay.

[kradalby]

@enoperm Do you mind fixing the prettier lint? I have a PR open to sort the golangci one, so you can ignore that for now.