Fix missing org_id of resource grafana_organization

[pallxk]

Test terraform config

terraform {
  required_providers {
    grafana = {
      source = "grafana/grafana"
    }
  }
}

resource "grafana_organization" "org_2" {
  name = "org_2"
}

output "org_id" {
  value = grafana_organization.org_2.org_id
}

Before

$ terraform output
╷
│ Warning: No outputs found
│ 
│ The state file either has no outputs defined, or all the defined outputs are empty. Please define an output in your configuration with the `output` keyword and run `terraform refresh` for it to become available. If you are
│ using interpolation, please verify the interpolated value is not empty. You can use the `terraform console` command to assist.
╵

After

$ terraform output
org_id = 2

[julienduchesne]

Thanks for your contribution @pallxk! I also added a test which lead me to find another bug 😄

[pallxk]

Great to have things tested! 😃