PowerShell discovery extension does not surface `adaptedResources` entries from `*.dsc.manifests.*` files

[Gijsreyn]

Summary of the new feature / enhancement

While testing the Microsoft.PowerShell/Discover extension, DSC resources declared as adaptedResources inside a manifest-list file (*.dsc.manifests.{json,yaml,yml}) are not picked up.

Proposed technical implementation details (optional)

No response