What is required for a view menu item to show up as a link in the admin page?
In addition to the report views needing to have "Page" displays with URLs nested under admin/reports/data, I also had to make sure the following settings were enabled under "Page: Menu item entry" settings within the Views:


Type: Normal menu entry
Menu: Management


Without both of these settings, the menu links will not show up under the new custom reports page.