[java-storage-nio] FakeStorageRpc/LocalStorageHelper: leads to logs about needing to call Builder#setApplicationName

#### Steps to reproduce

1. Use LocalStorageHelper at all
2. See log messages needing to call `setApplicationName`

#### Code example

Anything using LocalStorageHelper, eg

```
LocalStorageHelper.customOptions(true).getService().writer(...)
```

ends up running this code in FakeStorageRpc.java

```
public com.google.api.services.storage.Storage getStorage() {
HttpTransport transport = new FakeStorageRpcHttpTransport();
HttpRequestInitializer httpRequestInitializer = request -> {};
return new com.google.api.services.storage.Storage(
transport, new GsonFactory(), httpRequestInitializer);
}
```

This `Storage` constructor creates and then immediately uses a `Storage.Builder`, which means there's no place to call `Builder#setApplicationName`, leading to an unavoidable log.

#### Stack trace

The logged message is:

```
WARN com.google.api.client.googleapis.services.AbstractGoogleClient - Application name is not set. Call Builder#setApplicationName.
```