Fix Picker to use new dialog and also fix height issues

[ethanshar]

Description

I fixed here couple of things

• First, I'm always using the new dialog (Incubator.Dialog) in Picker since useDialog is a new feature there's no need to go thru migration
• There were some issues when the dialog height. When the user don't pass any height it should based the dialog height on its content. I fixed how the height is set and the layout inside PickerItemsList component

Changelog

Picker - Fix dialog UI when passing useDialog

Additional info

[hachem-benamor]

@ethanshar , It seems this issue resolves the problem on iOS and not Android? It works well on iOS but not on Android.