Clean logger subscriptions upon reconfiguration

### Describe the bug

If a logger is reconfigured with `configureLogger`, the old stream still sticks around. It would be better to clean up the old subscription (close it) so that we don't get duplicates every time its reconfigured.

### To Reproduce

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### Expected behavior

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### Actual behavior

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### Additional: Dart SDK info

_No response_

### Additional: pubspec.yaml

```yaml

```

### Additional: Context

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