Add store split for Get Dashboard version method (#49138)

* Add store split for Get Dashboard version method

* Implement dashboard version service

* Fix api tests

* Remove GetDashboarVersion from sqlstore

* Add fakes for Get dashboard version

* Fix sqlstore test

* Add Get Dashboard store test

* Add dashver service test

* Remove useless comments

pkg/services/dashboardversion/dashverimpl/dashver.go

@@ -0,0 +1,30 @@
+package dashverimpl
+
+import (
+	"context"
+
+	dashver "github.com/grafana/grafana/pkg/services/dashboardversion"
+	"github.com/grafana/grafana/pkg/services/sqlstore/db"
+	"github.com/grafana/grafana/pkg/setting"
+)
+
+type Service struct {
+	store store
+}
+
+func ProvideService(db db.DB, cfg *setting.Cfg) dashver.Service {
+	return &Service{
+		store: &sqlStore{
+			db: db,
+		},
+	}
+}
+
+func (s *Service) Get(ctx context.Context, query *dashver.GetDashboardVersionQuery) (*dashver.DashboardVersion, error) {
+	version, err := s.store.Get(ctx, query)
+	if err != nil {
+		return nil, err
+	}
+	version.Data.Set("id", version.DashboardID)
+	return version, nil
+}