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/ngalert/tests/util.go

@@ -10,8 +10,9 @@ import (
 	"github.com/grafana/grafana/pkg/api/routing"
 	"github.com/grafana/grafana/pkg/infra/log"
 	acmock "github.com/grafana/grafana/pkg/services/accesscontrol/mock"
+	"github.com/grafana/grafana/pkg/services/dashboards"
 	databasestore "github.com/grafana/grafana/pkg/services/dashboards/database"
-	dashboardservice "github.com/grafana/grafana/pkg/services/dashboards/manager"
+	dashboardservice "github.com/grafana/grafana/pkg/services/dashboards/service"
 	"github.com/grafana/grafana/pkg/services/featuremgmt"
 	"github.com/grafana/grafana/pkg/services/ngalert"
 	"github.com/grafana/grafana/pkg/services/ngalert/metrics"
@@ -60,12 +61,12 @@ func SetupTestEnv(t *testing.T, baseInterval time.Duration) (*ngalert.AlertNG, *
 	)
 	folderService := dashboardservice.ProvideFolderService(
 		cfg, dashboardService, dashboardStore, nil,
-		features, folderPermissions, ac, nil,
+		features, folderPermissions, ac,
 	)
 
 	ng, err := ngalert.ProvideService(
-		cfg, nil, routing.NewRouteRegister(), sqlStore,
-		nil, nil, nil, nil, secretsService, nil, m, folderService, ac,
+		cfg, nil, routing.NewRouteRegister(), sqlStore, nil, nil, nil, nil,
+		secretsService, nil, m, folderService, ac, &dashboards.FakeDashboardService{},
 	)
 	require.NoError(t, err)
 	return ng, &store.DBstore{