DataStore subscriptionDataProcessed event is dispatched twice

### Before opening, please confirm:

- [X] I have [searched for duplicate or closed issues](https://github.com/aws-amplify/amplify-android/issues?q=is%3Aissue+) and [discussions](https://github.com/aws-amplify/amplify-android/discussions).

### Language and Async Model

Java, Kotlin

### Amplify Categories

DataStore

### Gradle script dependencies

```groovy
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```

### Environment information

```
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```

### Please include any relevant guides or documentation you're referencing

_No response_

### Describe the bug

Observed from testing with amplify-flutter.

When a GraphQL subscription event arrives, after processing merge the data into local DB, `subscriptionDataProcessed` event gets dispatched twice via DataStore hub event channel.

It looks like that [this spot](https://github.com/aws-amplify/amplify-android/blob/main/aws-datastore/src/main/java/com/amplifyframework/datastore/syncengine/Merger.java#L115) were executed twice during the merge process following this order:
by 1) [here](https://github.com/aws-amplify/amplify-android/blob/main/aws-datastore/src/main/java/com/amplifyframework/datastore/storage/sqlite/SQLiteStorageAdapter.java#L376) and 2) [here](https://github.com/aws-amplify/amplify-android/blob/main/aws-datastore/src/main/java/com/amplifyframework/datastore/syncengine/VersionRepository.java#L63)

According to the source code and code commends, `subscriptionDataProcessed` event is dispatched on a successful data merge, which should be dispatched only once. Could you confirm if the current behavior is correct?

Additional context: amplify-ios emits a simple event `syncReceived` after the merging process triggered by a GraphQL subscription event. And `syncReceived` event gets dispatched once.

### Reproduction steps (if applicable)

1. Trigger a GraphQL subscription from any valid source
2. Observe `subscriptionDataProcessed` event on DataStore hub

### Code Snippet

```java
// Put your code below this line.

```

### Log output

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### amplifyconfiguration.json

_No response_

### GraphQL Schema

```graphql
// Put your schema below this line

```

### Additional information and screenshots

_No response_

Read Merger.java around line 115, then trace the two merge paths identified in SQLiteStorageAdapter.java line 376 and VersionRepository.java line 63. Reproduce with a GraphQL subscription and observe the DataStore Hub; done means subscriptionDataProcessed is dispatched once after a successful merge.

Written by the indexing model from the issue text.