When adding a new service to an env group that is already linked to a service, the env group link should first be imported into Terraform state. This updates the provider to return an error when it detects an un-imported env group link to prevent an inconsistent state error after creation.
When adding a new service to an env group that is already linked to a service, the env group link should first be imported into Terraform state. This updates the provider to return an error when it detects an un-imported env group link to prevent an inconsistent state error after creation.
Fixes #29