Ensure formatForTelescope method is used in request watcher

[duncanmcclean]

In #1562, I made it possible for developers to hook into how objects are seralized by Telescope by adding a formatForTelescope method to your objects.

public function formatForTelescope(): array
{
    // Returns a different representation of this class
}

In our case, this method allows us to prevent infinite loops.

However, during some additional testing on our end, I realised that I forgot to implement this hook for the RequestWatcher which serialized the variables available in Blade views.

I've provided a test for this change.