K8s: Improve identity mapping setup (#89450)

pkg/registry/apis/datasource/authorizer.go

@@ -6,7 +6,7 @@ import (
 
 	"k8s.io/apiserver/pkg/authorization/authorizer"
 
-	"github.com/grafana/grafana/pkg/infra/appcontext"
+	"github.com/grafana/grafana/pkg/apimachinery/identity"
 	ac "github.com/grafana/grafana/pkg/services/accesscontrol"
 	"github.com/grafana/grafana/pkg/services/datasources"
 )
@@ -17,7 +17,7 @@ func (b *DataSourceAPIBuilder) GetAuthorizer() authorizer.Authorizer {
 			if !attr.IsResourceRequest() {
 				return authorizer.DecisionNoOpinion, "", nil
 			}
-			user, err := appcontext.User(ctx)
+			user, err := identity.GetRequester(ctx)
 			if err != nil {
 				return authorizer.DecisionDeny, "valid user is required", err
 			}