chore(idempotency): refactor aws sdk init logic (#1768)

Author: dreamorosi

Diff for: packages/idempotency/src/persistence/DynamoDBPersistenceLayer.ts

@@ -81,15 +81,17 @@ class DynamoDBPersistenceLayer extends BasePersistenceLayer {
     this.staticPkValue =
       config.staticPkValue ?? `idempotency#${this.idempotencyKeyPrefix}`;
 
-    this.client = new DynamoDBClient(config?.clientConfig ?? {});
-    if (config?.awsSdkV3Client) {
-      if (isSdkClient(config.awsSdkV3Client)) {
-        this.client = config.awsSdkV3Client;
-      } else {
+    if (config.awsSdkV3Client) {
+      if (!isSdkClient(config.awsSdkV3Client)) {
         console.warn(
           'awsSdkV3Client is not an AWS SDK v3 client, using default client'
         );
+        this.client = new DynamoDBClient(config.clientConfig ?? {});
+      } else {
+        this.client = config.awsSdkV3Client;
       }
+    } else {
+      this.client = new DynamoDBClient(config.clientConfig ?? {});
     }
     addUserAgentMiddleware(this.client, 'idempotency');
   }