Remove required for timeout and ttl fields

[dfarr]

The struct tag binding "required" excludes setting 0, which is valid for both ttl and timeout.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 57.05%. Comparing base (e4c6977) to head (f2f3658). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/app/coroutines/schedulePromises.go	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #437 +/- ## ========================================== - Coverage 57.07% 57.05% -0.02% ========================================== Files 115 115 Lines 11557 11559 +2 ========================================== - Hits 6596 6595 -1 - Misses 4497 4500 +3 Partials 464 464 ```

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