Adapt logs to work with the Krateo log stack

[EdmondDantes21]

The timestamp field in the logs is a Unix epoch integer (e.g. "time": 1780037852).

logs-ingester requires the RFC3339/RFC3339Nano format.

Logs should be created as shown here: https://github.com/krateoplatformops/events-presenter/blob/e3061aa23156014a9c2f90c9594b77a8161d96fb/internal/config/config.go#L120