API: Support creating a nested folder (#58508)

* API: Support nested folder creation

* Update swagger

* fixup

* Update pkg/api/dtos/folder.go

Co-authored-by: Serge Zaitsev <serge.zaitsev@grafana.com>

* Fix some tests

* create legacy folder url from title and uid

Co-authored-by: idafurjes <36131195+idafurjes@users.noreply.github.com>
Co-authored-by: Serge Zaitsev <serge.zaitsev@grafana.com>
Co-authored-by: Ida Furjesova <ida.furjesova@grafana.com>

pkg/services/folder/folderimpl/sqlstore.go

@@ -36,6 +36,15 @@ func (ss *sqlStore) Create(ctx context.Context, cmd folder.CreateFolderCommand)
 	}
 
 	var foldr *folder.Folder
+	/*
+		user, err := appcontext.User(ctx)
+		if err != nil {
+			return nil, err
+		}
+		version := 1
+		updatedBy := user.UserID
+		createdBy := user.UserID
+	*/
 	err := ss.db.WithDbSession(ctx, func(sess *db.Session) error {
 		var sqlOrArgs []interface{}
 		if cmd.ParentUID == "" {
@@ -47,7 +56,7 @@ func (ss *sqlStore) Create(ctx context.Context, cmd folder.CreateFolderCommand)
 					UID:   &cmd.ParentUID,
 					OrgID: cmd.OrgID,
 				}); err != nil {
-					return err
+					return folder.ErrFolderNotFound.Errorf("parent folder does not exist")
 				}
 			}
 			sql := "INSERT INTO folder(org_id, uid, parent_uid, title, description, created, updated) VALUES(?, ?, ?, ?, ?, ?, ?)"