The network interfaces are automatically cleaned up by deleting the VPC endpoint. We just have to wait for the endpoint to be deleted which takes a bit of time.
Coverage remained the same at 24.248% when pulling b62df0d0cf574e5d4993442f0940048ec4c07f34 on fix-kms-cleanup into 83c38f8be0499d45dd9b1f2ad6bf6b6481c8f2bb on master.
Follow up to #106
The network interfaces are automatically cleaned up by deleting the VPC endpoint. We just have to wait for the endpoint to be deleted which takes a bit of time.