AMG Terraform article should mention terraform API key resource

[zspeaks]

Hey there!

This recipe: https://aws-observability.github.io/observability-best-practices/recipes/recipes/amg-automation-tf/
has the user manually creating an API key to use in their terraform deployment (and then hardcoding it later)

It would be great if it could be updated to mention using the API key terraform resource: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/grafana_workspace_api_key to automatically create an API key instead of having the user do so by hand