Renderer: add version information (#34964) (#35245)

* Renderer: add version information

* fix alerting test

(cherry picked from commit 5f6c172b5a)

Co-authored-by: Agnès Toulet <35176601+AgnesToulet@users.noreply.github.com>

pkg/services/alerting/notifier_test.go

@@ -377,6 +377,10 @@ func (s *testRenderService) GetRenderUser(key string) (*rendering.RenderUser, bo
 	return nil, false
 }
 
+func (s *testRenderService) Version() string {
+	return ""
+}
+
 var _ rendering.Service = &testRenderService{}
 
 type testImageUploader struct {