Chore: Use response limit middleware from SDK (#83915)

pkg/registry/apis/datasource/middleware.go

@@ -0,0 +1,15 @@
+package datasource
+
+import (
+	"context"
+
+	"github.com/grafana/grafana-plugin-sdk-go/backend"
+	"github.com/grafana/grafana-plugin-sdk-go/backend/httpclient"
+)
+
+func contextualMiddlewares(ctx context.Context) context.Context {
+	cfg := backend.GrafanaConfigFromContext(ctx)
+	m := httpclient.ResponseLimitMiddleware(cfg.ResponseLimit())
+
+	return httpclient.WithContextualMiddleware(ctx, m)
+}