[BUG] CloudWatch Logs Sink not generating LogEventSuccessMetrics

[MaGonzalMayedo]

Describe the bug
When collecting metrics from CloudWatch Logs, if there are no event_handles in the source type, the sink does not properly update the "LogEventsSucceededCounter".

To Reproduce
Steps to reproduce the behavior:

1. Set up Data-Prepper config with http source and cloudwatch_logs sink and configured CloudWatch metrics.
2. Sent POST requests with log information to Data-Prepper server instance.

Expected behavior
When reading the collected metrics from the sink, a positive value for the events succeeded was expected as log events were being received. But instead received 0 for the entire logging period.

Screenshots

Environment (please complete the following information):

• OS: macOS Ventura
• Version 13.4

[dlvenable]

Closed by #3114.