[Cluster Test] ensuring both balances are sorted (#11261)

## Description 

Adding the same sort to the vectors 

## Test Plan 

CI / Staging runs
---
If your changes are not user-facing and not a breaking change, you can
skip the following section. Otherwise, please indicate what changed, and
then add to the Release Notes section as highlighted during the release
process.

### Type of Change (Check all that apply)

- [ ] user-visible impact
- [ ] breaking change for a client SDKs
- [ ] breaking change for FNs (FN binary must upgrade)
- [ ] breaking change for validators or node operators (must upgrade
binaries)
- [ ] breaking change for on-chain data layout
- [ ] necessitate either a data wipe or data migration

### Release notes

crates/sui-cluster-test/src/test_case/coin_index_test.rs

@@ -216,7 +216,7 @@ impl TestCaseImpl for CoinIndexTest {
             10000, // mint amount
         );
 
-        let balances = client.coin_read_api().get_all_balances(account).await?;
+        let mut balances = client.coin_read_api().get_all_balances(account).await?;
         let mut expected_balances = vec![
             Balance {
                 coin_type: sui_type_str.into(),
@@ -232,7 +232,8 @@ impl TestCaseImpl for CoinIndexTest {
             },
         ];
         // Comes with asc order.
-        expected_balances.sort_by(|l, r| l.coin_type.cmp(&r.coin_type));
+        expected_balances.sort_by(|l: &Balance, r| l.coin_type.cmp(&r.coin_type));
+        balances.sort_by(|l: &Balance, r| l.coin_type.cmp(&r.coin_type));
 
         assert_eq!(balances, expected_balances,);