Search: Fix empty folder details for nested folder items (#76504)

* Introduce dashboard.folder_uid column

* Add data migration

* Search: Fix empty folder details for nested folders

* Set `dashboard.folder_uid` and update tests

* Add unique index

* lint

Ignore cyclomatic complexity of func
`(*DashboardServiceImpl).BuildSaveDashboardCommand

* Fix search by folder UID

pkg/api/dashboard.go

@@ -412,10 +412,13 @@ func (hs *HTTPServer) postDashboard(c *contextmodel.ReqContext, cmd dashboards.S
 
 	cmd.OrgID = c.SignedInUser.GetOrgID()
 	cmd.UserID = userID
-	if cmd.FolderUID != "" {
+	// nolint:staticcheck
+	if cmd.FolderUID != "" || cmd.FolderID != 0 {
 		folder, err := hs.folderService.Get(ctx, &folder.GetFolderQuery{
-			OrgID:        c.SignedInUser.GetOrgID(),
-			UID:          &cmd.FolderUID,
+			OrgID: c.SignedInUser.GetOrgID(),
+			UID:   &cmd.FolderUID,
+			// nolint:staticcheck
+			ID:           &cmd.FolderID,
 			SignedInUser: c.SignedInUser,
 		})
 		if err != nil {
@@ -424,7 +427,9 @@ func (hs *HTTPServer) postDashboard(c *contextmodel.ReqContext, cmd dashboards.S
 			}
 			return response.Error(http.StatusInternalServerError, "Error while checking folder ID", err)
 		}
+		// nolint:staticcheck
 		cmd.FolderID = folder.ID
+		cmd.FolderUID = folder.UID
 	}
 
 	dash := cmd.GetDashboardModel()
@@ -1073,7 +1078,9 @@ func (hs *HTTPServer) RestoreDashboardVersion(c *contextmodel.ReqContext) respon
 	saveCmd.Dashboard.Set("version", dash.Version)
 	saveCmd.Dashboard.Set("uid", dash.UID)
 	saveCmd.Message = fmt.Sprintf("Restored from version %d", version.Version)
+	// nolint:staticcheck
 	saveCmd.FolderID = dash.FolderID
+	saveCmd.FolderUID = dash.FolderUID
 
 	return hs.postDashboard(c, saveCmd)
 }