Remove commented test (#3051)

Tests have been added to other locations for the functionality being
tested by this commented out code.

----

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aws/sdk/integration-tests/s3/tests/config-override.rs

@@ -67,39 +67,3 @@ async fn operation_overrides_dual_stack() {
         "https://test-bucket.s3.dualstack.us-west-2.amazonaws.com/?list-type=2"
     );
 }
-
-// TODO(enableNewSmithyRuntimeCleanup): Comment in the following test once Handle is no longer
-//  accessed in ServiceRuntimePlugin::config. Currently, a credentials cache created for a single
-//  operation invocation is not picked up by an identity resolver.
-/*
-#[tokio::test]
-async fn operation_overrides_credentials_provider() {
-    let (captured_request, client) = test_client();
-    let _ = client
-        .list_objects_v2()
-        .bucket("test-bucket")
-        .customize()
-        .config_override(aws_sdk_s3::config::Config::builder().credentials_provider(Credentials::new(
-            "test",
-            "test",
-            Some("test".into()),
-            Some(std::time::UNIX_EPOCH + std::time::Duration::from_secs(1669257290 + 3600)),
-            "test",
-        )))
-        .send()
-        .await;
-
-    let request = captured_request.expect_request();
-    let actual_auth =
-        std::str::from_utf8(request.headers().get("authorization").unwrap().as_bytes()).unwrap();
-    // signature would be f98cc3911dfba0daabf4343152f456bff9ecd3888a3068a1346d26949cb8f9e5
-    // if we used `Credentials::for_tests()`
-    let expected_sig = "Signature=d7e7be63efc37c5bab5eda121999cd1c9a95efdde0cc1ce7c1b8761051cc3cbd";
-    assert!(
-        actual_auth.contains(expected_sig),
-        "authorization header signature did not match expected signature: expected {} but not found in {}",
-        expected_sig,
-        actual_auth,
-    );
-}
-*/