[Wallet] Resolve images in the AIF for every image type.

AutofillImageFetcher.

This CL is a no-op. It generalizes the AIF::ResolveCardArtImage
method to AIF::ResolveImage which works for every supported image
type. This refactoring is a scaffolding for the upcoming work
which unifies the logic of how images are fetched inside the AIF.

Bug: 404437211
Change-Id: I7919fafe801400c363abd04c18f69e7327dc49e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6508971
Reviewed-by: Vincent Boisselle <vincb@google.com>
Commit-Queue: Timofey Chudakov <tchudakov@google.com>
Reviewed-by: Vishwas Uppoor <vishwasuppoor@google.com>
Reviewed-by: Norge Vizcay <vizcay@google.com>
Cr-Commit-Position: refs/heads/main@{#1456130}