Don't fail worker on SSE-delivery exception

[Olegt0rr]

What do these changes do?

Makes worker example durable to delivery exceptions

Are there changes in behavior for the user?

No

Related issue number

Closes #429

Checklist

• [x] I think the code is well written
• [x] Unit tests for the changes exist
• [x] Documentation reflects the changes

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (21cb76e) 99.47% compared to head (cd28e1d) 99.49%. Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #430 +/- ## ========================================== + Coverage 99.47% 99.49% +0.01% ========================================== Files 4 4 Lines 381 394 +13 Branches 45 45 ========================================== + Hits 379 392 +13 Misses 1 1 Partials 1 1 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.