Include custom link in Tile object tileClicked event

When embedding a dashboard tile, the tileClicked event for a tile representing a powerbi report has the following properties

```{
navigationUrl: "https://app.powerbi.com/reports/6ef78595-.../ReportSection",
errors: undefined
openReport: {
embedUrl: "https://app.powerbi.com/reportEmbed?reportId=6ef78595-..."
reportId: "6ef78595-..."
}
}```

however a tile that represents other content (such as web) produces:

```
{
errors:undefined,
navigationUrl:null,
openReport: {
embedUrl:"",
reportId:""
}
}
```

it would be good if the api populated `navigationUrl` property with the custom link defined in the tile