fix(backend): get pipeline by name is broken due to version typo, Fixes

kubeflow#9940 (kubeflow#10268)

function getPipelineByName have a version typo:
V1beta1 -> v1beta1

backend/src/apiserver/server/pipeline_server.go

@@ -314,7 +314,7 @@ func (s *PipelineServer) getPipelineByName(ctx context.Context, name string, nam
 	switch apiRequestVersion {
 	case "v1beta1":
 		return s.resourceManager.GetPipelineByNameAndNamespaceV1(name, namespace)
-	case "V2beta1":
+	case "v2beta1":
 		p, err := s.resourceManager.GetPipelineByNameAndNamespace(name, namespace)
 		return p, nil, err
 	default: