fix: properly parse null raw labels for logs (#3506)

Co-authored-by: David Townley <davidtownley@Davids-MacBook-Air.local>

dashboard/src/main/home/app-dashboard/expanded-app/logs/types.ts

@@ -34,7 +34,7 @@ const agentLogMetadataValidator = z.object({
     revision: z.string(),
     output_stream: z.string(),
     app_name: z.string(),
-    // raw_labels: rawLabelsValidator.optional(),
+    raw_labels: rawLabelsValidator.nullish(),
 });
 
 export const agentLogValidator = z.object({