Fix some bugs for the create flow

1.When create for the first time and credential type is not passkey(before even when the createOption size is only 1, we still wrongly ask users to select a createOption)
2.When createOption is only one, the activeProvider should not just be the first one but should be the one has this only createOption
3.Only when requestInfo is firstUse and type is passkey, we show passkey intro page

Test: deployed locally

Bug: 253157231
Change-Id: Ie6ff0582bdf9224a9f714602a356040e16342ee0