[I] Default headers not signed for CompleteMultipartUpload [arrow-rs-object-store]

["jizezhang (via GitHub)" <gi...@apache.org>]

jizezhang opened a new issue, #708:
URL: https://github.com/apache/arrow-rs-object-store/issues/708

   **Describe the bug**
   <!--
   A clear and concise description of what the bug is.
   -->
   When doing a multi-part upload with custom default headers, I got error
   ```
   <Error><Code>AccessDenied</Code><Message>There were headers present in the request which were not signed</Message><HeadersNotSigned>x-amz-source-arn, x-amz-source-account</HeadersNotSigned><RequestId>S1M1M0EQ5CQ54ZJX</RequestId><HostId>GxzMeUORtnnBE+vW7Kvx7T3XTomOpT65svEnSR5PiF/ggePM3NkvkVG4bOrANC49aeL9c7jtfjUy269PDMsGjv2rcR7VO9Gp</HostId></Error>
   ```
   
   **To Reproduce**
   <!--
   Steps to reproduce the behavior:
   -->
   ```
   use object_store::ClientOptions;
   use object_store::HeaderMap;
   use object_store::ObjectStoreExt;
   use object_store::aws::AmazonS3Builder;
   use object_store::path::Path;
   use tracing_subscriber::EnvFilter;
   
   #[tokio::main]
   async fn main() {
       tracing_subscriber::fmt()
           .with_env_filter(EnvFilter::from_default_env())
           .with_thread_ids(true)
           .init();
   
       let mut headers = HeaderMap::new();
       headers.insert("x-amz-source-account", "123456789111".parse().unwrap());
       headers.insert(
           "x-amz-source-arn",
           "arn:aws:s3:::source-bucket"
               .parse()
               .unwrap(),
       );
   
       let client = AmazonS3Builder::from_env()
           .with_bucket_name("bucket-name")
           .with_region("us-east-1")
           .with_client_options(ClientOptions::new().with_default_headers(headers))
           .build()
           .unwrap();
   
       let mut upload = client.put_multipart(&Path::from("test-mpu")).await.unwrap();
       let res = upload.complete().await.unwrap();
       println!("Upload complete: {:?}", res);
   }
   
   ```
   
   **Expected behavior**
   <!--
   A clear and concise description of what you expected to happen.
   -->
   Headers are signed. No error.
   
   **Additional context**
   <!--
   Add any other context about the problem here.
   -->


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