Fix event stream error handling and reconnection

[kschiffer]

Summary

This PR fixes error handling and reconnection logic of event streams.

Changes

• Convert stream errors to error objects
• Implement a timeout for WebSocket connection attempts
• Fix checks that determine whether reconnects should be attempted

Testing

Local testing.

Notes for Reviewers

This is a somewhat preliminary fix to get the reconnects working again. Error handling in general needs some more love since error propagation is now quite different under the WebSocket logic than it has been before. Concretely we should look into how to identify special errors such as authentication and network errors when using the WebSocket connection to apply special logic in these cases.

Checklist

• Scope: The referenced issue is addressed, there are no unrelated changes.
• Compatibility: The changes are backwards compatible with existing API, storage, configuration and CLI, according to the compatibility commitments in README.md for the chosen target branch.
• Documentation: Relevant documentation is added or updated.
• The steps/process to test this feature are clearly explained including testing for regressions.
• Changelog: Significant features, behavior changes, deprecations and fixes are added to CHANGELOG.md.
• Commits: Commit messages follow guidelines in CONTRIBUTING.md, there are no fixup commits left.

[adriansmares]

Based on my local test, this seems to work.

[kschiffer]

Still working on some fine-tuning here. Will merge later today.

[mjamescompton]

I've not got that much context for this so i've mostly spent some time to look over how this all works. Nothing to add as I think I need more time to really get my head into this. I can put more time daily to catch up with all this.