remove execution plan cost extraction (#9631)
remove execution plan cost extraction (#9631)

* remove execution plan cost extraction

Extraction of cost from execution plans is now being done during ingestion.

* style
DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core