Clean up card assignment when only one member and/or card

[joekaufmanexpensify]

Coming from here, if you assign a third party card now on a workspace with only one member and/or card, you have to manually select the member and the card. This is unnecessary because the member will always see the card being assigned and to whom on the confirmation page Let's update this so:

• If there's one workspace member, we select them automatically (skipping the step) and land directly on the card selection.
• If there's multiple workspace members, but only one card, after selecting a member, we select the card automatically (skipping the step) and landing on the start date.
• If there's one workspace member AND one card, automatically select the member and card (skipping both steps) and land directly on the transaction start date.

cc @mountiny @JmillsExpensify

[melvin-bot[bot]]

Triggered auto assignment to @kadiealexander (Bug), see https://stackoverflow.com/c/expensify/questions/14418 for more details. Please add this bug to a GH project, as outlined in the SO.

[joekaufmanexpensify]

It sounds like maybe @koko57 will take this one?

[koko57]

looks like I'm the chosen one 😃 yup, taking it!

[joekaufmanexpensify]

TY!

[koko57]

PR opened for review https://github.com/Expensify/App/pull/52871