Support dashboard restore across API versions (#110694)

What

This commit refactors the logic to restore a dashboard from a version.
The logic is moved from the API handler to the dashboard versions service,
which now supports restoring dashboards of different API versions.

Why

To make sure that dashboard version restoration works with v2 dashboards
API, as well as future API versions.

Signed-off-by: Igor Suleymanov <igor.suleymanov@grafana.com>

pkg/services/dashboardversion/model.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"time"
 
+	"github.com/grafana/grafana/pkg/apimachinery/identity"
 	"github.com/grafana/grafana/pkg/components/simplejson"
 )
 
@@ -60,6 +61,15 @@ type DeleteExpiredVersionsCommand struct {
 	DeletedRows int64
 }
 
+// RestoreVersionCommand is used to restore a dashboard version.
+// Only one of DashboardID and DashboardUID are required.
+type RestoreVersionCommand struct {
+	Requester    identity.Requester
+	DashboardUID string
+	DashboardID  int64
+	Version      int64
+}
+
 type ListDashboardVersionsQuery struct {
 	DashboardID   int64
 	DashboardUID  string