Navigation: show breadcrumbs correctly when on the home page (#55759)

* show breadcrumbs correctly when on the home page

* adjust breadcrumb unit tests

* update betterer

* fix backend tests

* update getSectionRoot to look at the home nav id

* remove redundant setting of home dashboard

* construct a home navmodelitem in the backend

* fix cases when the feature toggle is off

* fix unit test

* fix more unit tests

* refactor how buildBreadcrumbs works

* use HOME_NAV_ID

* move homeNav useSelector into NavToolbar

* remove unnecesary cloneDeep

* don't need locationUtil here

* restore using getUrlForPartial in DashboardPage

* special case for the editview query param

* remove commented out code

* add comment to clarify splice behaviour

* slightly cleaner syntax

pkg/api/dashboard.go

@@ -538,7 +538,6 @@ func (hs *HTTPServer) GetHomeDashboard(c *models.ReqContext) response.Response {
 	}()
 
 	dash := dtos.DashboardFullWithMeta{}
-	dash.Meta.IsHome = true
 	dash.Meta.CanEdit = c.SignedInUser.HasRole(org.RoleEditor)
 	dash.Meta.FolderTitle = "General"
 	dash.Dashboard = simplejson.New()