Allow admins to define pre-pinned resources on Dev navigation

Overview

Today in the Dev Perspective navigation, we have pre-pinned resources in the "third section" of the vertical navigation. Customers have asked if there is a way for admins to to provide defaults for those pre-pinned resources for all users.

Acceptance Criteria

1. Add a section to the Cluster/Console menu for Developer pre-pinned resources
2. Admin can define which nav items exist by default for all users & is able to re-order them
3. These defaults should be used as the default pre-pinned items for all new users
4. Users who's nav items have not been customized will inherit these defaults the next time they log in. 

Exploration Results

Miro Board

Slack Channel

tbd