Merge multiple polygons during spatial coverage harvesting

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Merge multiple polygons during spatial coverage harvesting #3039

Closed ThibaudDauce closed 2 months ago

ThibaudDauce commented 3 months ago

Fix https://github.com/datagouv/data.gouv.fr/issues/1362

The goal of this PR is to support when there is multiple geometries. Instead of saving the first one, save a MultiPolygon merging all geometries. Deduplicates the geometries because some backends provide the same geometry in multiple formats.