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_test.go

@@ -78,7 +78,6 @@ func TestGetHomeDashboard(t *testing.T) {
 	for _, tc := range tests {
 		t.Run(tc.name, func(t *testing.T) {
 			dash := dtos.DashboardFullWithMeta{}
-			dash.Meta.IsHome = true
 			dash.Meta.FolderTitle = "General"
 
 			homeDashJSON, err := os.ReadFile(tc.expectedDashboardPath)