feat(test-utils): Add a way to wait for single spans for Span streaming

[github-actions]

Note

The pull request "feat(test-utils): Add a way to wait for single spans for Span streaming" was created by @JPeer264 but did not reference an issue. Therefore this issue was created for better visibility in external tools like Linear.

How it should be used is in the JSDoc. It worked quite well for my Cloudflare tests

[linear]

JS-1558

[logaretm]

@JPeer264 should we close this since the PR should've already closed it? Looks like it wasn't autoclosed for some reason.

[JPeer264]

Ok interesting. The base branch was not develop that is why it wasn't closed on its own. Maybe we have to adapt the GH action to not add this in that case