Log error if sync has finished with an error

[artem-shelkovnikov]

Problem Description

Currently there is no way to see which error caused sync to finish - this does not get logged consistently. This information is displayed in UI, but we should also log the error that caused the sync to terminate in the end of the process.

Proposed Solution

Add a log line around https://github.com/elastic/connectors/blob/main/connectors/sync_job_runner.py#L394 that outputs the exception that caused this sync to finish.

Alternatives

Investigate a better place to log error