insight: Set compute series to type mapping-compute when created
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Created by: CristinaBirkel
Right now when the createLineChartSearchInsight endpoint is used to create a compute insight, (which is how we're doing it for v1 to save time,) it doesn't set the series to use generation_method of mapping-compute. Small oversight but needs to be fixed so that the right generation method gets used to backfill the series.