K8s: Folders: Modify GetChildren to return only Folder References (#103072)

* Return FolderReference instead of Folder on GetChildren

Signed-off-by: Maicon Costa <maiconscosta@gmail.com>

---------

Signed-off-by: Maicon Costa <maiconscosta@gmail.com>

pkg/services/folder/model.go

@@ -63,6 +63,18 @@ type Folder struct {
 	ManagedBy utils.ManagerKind `json:"managedBy,omitempty"`
 }
 
+type FolderReference struct {
+	// Deprecated: use UID instead
+	ID        int64  `xorm:"pk autoincr 'id'"`
+	UID       string `xorm:"uid"`
+	Title     string
+	ParentUID string `xorm:"parent_uid"`
+
+	// When the folder belongs to a repository
+	// NOTE: this is only populated when folders are managed by unified storage
+	ManagedBy utils.ManagerKind `json:"managedBy,omitempty"`
+}
+
 var GeneralFolder = Folder{ID: 0, Title: "General"}
 var RootFolder = &Folder{ID: 0, Title: "Dashboards", UID: GeneralFolderUID, ParentUID: ""}
 var SharedWithMeFolder = Folder{
@@ -89,6 +101,16 @@ func (f *Folder) WithURL() *Folder {
 	return f
 }
 
+func (f *Folder) ToFolderReference() *FolderReference {
+	return &FolderReference{
+		ID:        f.ID,
+		UID:       f.UID,
+		Title:     f.Title,
+		ParentUID: f.ParentUID,
+		ManagedBy: f.ManagedBy,
+	}
+}
+
 // NewFolder tales a title and returns a Folder with the Created and Updated
 // fields set to the current time.
 func NewFolder(title string, description string) *Folder {
@@ -221,9 +243,6 @@ type GetChildrenQuery struct {
 
 	// array of folder uids to filter by
 	FolderUIDs []string `json:"-"`
-
-	// Deprecated: this is a temporary flag, and will be removed once we migrate the alerting use case
-	RefOnly bool
 }
 
 type HasEditPermissionInFoldersQuery struct {