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This CL splits the current AutofillAction into UseAddressAction and
UseCreditCardAction. Also splitting the unit tests.

Also fixing a small issue in client memory when checking
has_selected_address for an address key that exists but the contents
are a nullptr.

Pending a next CL: refactor the fallback and required fields to share
the logic. Right now after the split, the code will be temporarily
duplicated.

Bug: b/141362833
Change-Id: I34fae5e1234695e679e571ea0e888c2b0e6230bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1855960
Commit-Queue: Marian Fechete <marianfe@google.com>
Reviewed-by: Clemens Arbesser <arbesser@google.com>
Cr-Commit-Position: refs/heads/master@{#705504}