backend/services: Move GetDashboard from sqlstore to dashboard service (#48971)

* rename folder to match package name
* backend/sqlstore: move GetDashboard into DashboardService

This is a stepping-stone commit which copies the GetDashboard function - which lets us remove the sqlstore from the interfaces in dashboards - without changing any other callers.
* checkpoint: moving GetDashboard calls into dashboard service
* finish refactoring api tests for dashboardService.GetDashboard

pkg/services/comments/service.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/grafana/grafana/pkg/services/accesscontrol"
 	"github.com/grafana/grafana/pkg/services/comments/commentmodel"
+	"github.com/grafana/grafana/pkg/services/dashboards"
 	"github.com/grafana/grafana/pkg/services/featuremgmt"
 	"github.com/grafana/grafana/pkg/services/live"
 	"github.com/grafana/grafana/pkg/services/sqlstore"
@@ -19,7 +20,9 @@ type Service struct {
 	permissions *commentmodel.PermissionChecker
 }
 
-func ProvideService(cfg *setting.Cfg, store *sqlstore.SQLStore, live *live.GrafanaLive, features featuremgmt.FeatureToggles, accessControl accesscontrol.AccessControl) *Service {
+func ProvideService(cfg *setting.Cfg, store *sqlstore.SQLStore, live *live.GrafanaLive,
+	features featuremgmt.FeatureToggles, accessControl accesscontrol.AccessControl,
+	dashboardService dashboards.DashboardService) *Service {
 	s := &Service{
 		cfg:      cfg,
 		live:     live,
@@ -27,7 +30,7 @@ func ProvideService(cfg *setting.Cfg, store *sqlstore.SQLStore, live *live.Grafa
 		storage: &sqlStorage{
 			sql: store,
 		},
-		permissions: commentmodel.NewPermissionChecker(store, features, accessControl),
+		permissions: commentmodel.NewPermissionChecker(store, features, accessControl, dashboardService),
 	}
 	return s
 }