Label metrics metadata with correct integration name and clean up metadata.csv  (#12585)
Label metrics metadata with correct integration name and clean up metadata.csv  (#12585)

* Clean up metadata.csv and label with correct integration name

* Fix columns

* Fix typo

* use source type name
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