fix(job-scheduler): avoid duplicates when upserting in a quick sequence #2991
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Why
This PR fixes this issue: #2988
How
This PR makes sure that the "nextMillis" portion of every repeatable jobs is always calculated on well defined so called "time slots". The offset is only used to calculate the "delay" option of the repeatable job so that it repeats at the appropriate time, but is not used for the "nextMillis" calculation anymore.