[data ingestion] redirect traffic to the bucket directly (#20672)

## Description 

temporary PR. Implicitly redirects traffic to the GCS bucket directly
making external developers to use a cheaper version of service


---

## Release notes

Check each box that your changes affect. If none of the boxes relate to
your changes, release notes aren't required.

For each box you select, include information after the relevant heading
that describes the impact of your changes that a user might notice and
any actions they must take to implement updates.

- [ ] Protocol: 
- [ ] Nodes (Validators and Full nodes): 
- [ ] Indexer: 
- [ ] JSON-RPC: 
- [ ] GraphQL: 
- [ ] CLI: 
- [ ] Rust SDK:
- [ ] REST API:

crates/sui-data-ingestion-core/src/reader.rs

@@ -333,7 +333,7 @@ impl CheckpointReader {
         let (exit_sender, exit_receiver) = oneshot::channel();
         let reader = Self {
             path,
-            remote_store_url,
+            remote_store_url: remote_store_url.map(transform_ingestion_url),
             remote_store_options,
             current_checkpoint_number: starting_checkpoint_number,
             last_pruned_watermark: starting_checkpoint_number,
@@ -429,3 +429,14 @@ impl DataLimiter {
         self.in_progress = self.queue.values().sum();
     }
 }
+
+fn transform_ingestion_url(ingestion_url: String) -> String {
+    // temporary code to redirect ingestion traffic directly to the bucket
+    if ingestion_url.contains("checkpoints.mainnet.sui.io") {
+        "https://storage.googleapis.com/mysten-mainnet-checkpoints".to_string()
+    } else if ingestion_url.contains("checkpoints.testnet.sui.io") {
+        "https://storage.googleapis.com/mysten-testnet-checkpoints".to_string()
+    } else {
+        ingestion_url
+    }
+}