CE-1847: use common GlobalAppBar
- Replaces custom GlobalAppBar with nav menu using the common-ui component
- Replaces the user login/logout buttons (uses common context and components, and retains the redirect to /login when accessing unauthorized resources)
- does NOT add the "create ioc button" to the global app bar (tbd in CE-426)
- removes unused getUser method from user context
- ensures page and app title is set, adds a breadcrumb utility function
Closes CE-1847
Edited by Christina Jenks