* add unimplemented registerAppStatusUpdater & remove observers for apps and legacyApps
* adapt NavLinksService to use new application observables
* merge availableApps$ and availableLegacyApps$
* updating core docs
* adapt the navLink updating methods
* filters the inaccessible apps from availableApps$
* restrict access to navigateToApp depending on app status
* fixes due to merge
* add statusUpdater$ to AppBase
* export new types
* disable navlink depending on app status
* update generated doc
* update snapshots for disabled prop
* Address josh review
* Address review comments
* fix merge conflicts
* adapt changes due to merge
* update generated doc
* add comment and fix navlink url for custom url apps
* add AppNavLinkStatus type to split app/navlink states
* fix typo
* review comments and improvements
* add functional tests
* update generated docs and migration guide
* fix wrong type cast on AppsMenuProvider.readLinks
* properly type return of navigateToApp