[Hubs] Re-ingest costs when prices are ingested

[flanakin]

📝 Scenario

As a FinOps hub admin, I need to re-ingest costs when prices are updated for the month in order to populate missing price data from Cost Management exports

💎 Solution

Update the ingestion_ExecuteETL pipeline to do the following:

1. After the 'If Has Capacity' activity runs successfully, check if the current export is for the "Prices" dataset.
2. If it is for "Prices", run a KQL extents query against the Ingestion database to see if there's an extent for the Costs dataset for the current month that is being ingested.
3. If no Costs data has been ingested for the current month, do nothing.
4. If Costs data for the current month has been ingested already, run the ingestion_ExecuteETL pipeline asynchronously for Costs and the current month.

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