Workspace templates now only include public boards

When you create boards from a workspace template, only public boards from the source workspace will be created. Private and Shareable boards will not be created.

We believe this change fixes some previously counterintuitive behaviour. Before, the template would duplicate all boards included in the workspace, including private and shareable boards. This would cause private boards to become public during the duplication. Some of these private boards may not even have been visible to the person who set up the template.