samples: bump timeouts

Author: nnegrey

vision/snippets/src/main/java/com/example/vision/snippets/PurgeProducts.java

@@ -51,7 +51,7 @@ public static void purgeOrphanProducts(String projectId, String computeRegion)
               .build();
 
       OperationFuture response = client.purgeProductsAsync(request);
-      response.getPollingFuture().get(90, TimeUnit.SECONDS);
+      response.getPollingFuture().get(180, TimeUnit.SECONDS);
 
       System.out.println("Orphan products deleted.");
     }

vision/snippets/src/main/java/com/example/vision/snippets/PurgeProductsInProductSet.java

@@ -59,7 +59,7 @@ public static void purgeProductsInProductSet(
               .build();
 
       OperationFuture<Empty, BatchOperationMetadata> response = client.purgeProductsAsync(request);
-      response.getPollingFuture().get(90, TimeUnit.SECONDS);
+      response.getPollingFuture().get(180, TimeUnit.SECONDS);
 
       System.out.println("Products removed from product set.");
     }