fix(classifications): Make label optional (#1842)

I believe this was the originally intended payload.

Author: lforst

js/util/object.ts

@@ -21,7 +21,7 @@ export type OtherExperimentLogFields = {
   error: unknown;
   tags: string[];
   scores: Record<string, number | null>;
-  classifications?: Record<string, { id: string; label: string }[]>;
+  classifications?: Record<string, { id: string; label?: string }[]>;
   metadata: Record<string, unknown>;
   metrics: Record<string, unknown>;
   datasetRecordId: string;