fix missing ConnectionRetryCount on DSN (#10830)
fix missing ConnectionRetryCount on DSN (#10830)

If DSN is set then we need to append to the existing connection string instead of reassigning it.
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