invallid taging index update in cache check

Author: benesjan

yarn-project/pxe/src/contract_function_simulator/execution_tagging_index_cache.ts

@@ -13,6 +13,10 @@ export class ExecutionTaggingIndexCache {
   }
 
   public setTaggingIndex(secret: DirectionalAppTaggingSecret, index: number) {
+    const currentValue = this.taggingIndexMap.get(secret.toString());
+    if (currentValue !== undefined && currentValue !== index - 1) {
+      throw new Error(`Invalid tagging index update. Current value: ${currentValue}, new value: ${index}`);
+    }
     this.taggingIndexMap.set(secret.toString(), index);
   }