[AWS::Grafana::Workspace] - [Coverage] - configuration property not supported (present in CreateWorkspace API)

### Name of the resource

AWS::Grafana::Workspace

### Resource name

AWS::Grafana::Workspace

### Description

The Amazon Managed Grafana CreateWorkspace / UpdateWorkspace API accepts a configuration parameter (JSON string, length 2–65536) that sets workspace-level Grafana configuration — e.g. enabling plugins and Grafana unified alerting. This property is not exposed on the AWS::Grafana::Workspace CloudFormation resource, so workspace configuration cannot be managed as infrastructure-as-code and must be set out-of-band via the API/console after stack creation.

API reference: https://docs.aws.amazon.com/grafana/latest/APIReference/API_CreateWorkspace.html (configuration)
CFN resource reference (property absent): https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/aws-resource-grafana-workspace.html

### Other Details

_No response_

Start with the linked Amazon Managed Grafana CreateWorkspace and UpdateWorkspace API reference, then compare its configuration parameter with the linked AWS::Grafana::Workspace CloudFormation resource reference. Done means configuration can be managed through the CloudFormation resource rather than set out of band. The issue names no repository files, entry points, or tests.

Written by the indexing model from the issue text.