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/sqlstore/dashboard.go

@@ -29,28 +29,6 @@ func init() {
 
 var generateNewUid func() string = util.GenerateShortUID
 
-func (ss *SQLStore) GetDashboard(ctx context.Context, query *models.GetDashboardQuery) error {
-	return ss.WithDbSession(ctx, func(dbSession *DBSession) error {
-		if query.Id == 0 && len(query.Slug) == 0 && len(query.Uid) == 0 {
-			return models.ErrDashboardIdentifierNotSet
-		}
-
-		dashboard := models.Dashboard{Slug: query.Slug, OrgId: query.OrgId, Id: query.Id, Uid: query.Uid}
-		has, err := dbSession.Get(&dashboard)
-
-		if err != nil {
-			return err
-		} else if !has {
-			return models.ErrDashboardNotFound
-		}
-
-		dashboard.SetId(dashboard.Id)
-		dashboard.SetUid(dashboard.Uid)
-		query.Result = &dashboard
-		return nil
-	})
-}
-
 type DashboardSearchProjection struct {
 	ID          int64  `xorm:"id"`
 	UID         string `xorm:"uid"`