* When getting a public dashboard, backend returns a response structured the same as when you get a regular dashboard
* Updates backend tests for getting public dashboard
* Frontend can load the public dashboard based on the pubdash uid provided
* adds frontend test to make sure public dashboard doesnt render toolbar and submenu
* sorts imports
This PR adds endpoints for saving and retrieving a public dashboard configuration and and api endpoint to retrieve the public dashboard.
All of this is highly experimental and APIs will change. Notably, we will be removing isPublic from the dashboard model and moving it over to the public dashboard table in the next release.
Further context can be found here: https://github.com/grafana/grafana/pull/49131#issuecomment-1145456952
