Werk #15171: Datadog special agent: Fix time shifts when querying logs

When querying logs from the Datadog API, there was a shift in the time window of the query. The shift corresponded to the UTC offset of the local time zone of the monitoring server. This was caused by misinterpreting local times as UTC times.

For example, if the local time zone of the monitoring server is CET, then there was a shift of one hour into the future, causing the agent to query future logs. If the local time zone of the monitoring server is UTC, there was no shift.

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