Improve the workload template experience

[baronfel]

The currently if workloads get out of sync, the templates vanish. Can we include the templates in the sdk or include a "breadcrumb" template that lets you install the workloads. File new "install maui" would be an improved experience for sure.

Leading proposals are:

• auto-install workload template packs as part of manifest update, or
• include template information in manifest payloads and update the workload template resolver to use that data as an alternative source of template information