Move refill event logging from TriggerRefill to OnDidFillOrPreviewForm

Previously, TriggerRefill would log metrics using OnDidRefill with an
AddressFormEventLogger object, even though those could be triggered
for a payments form. Moreover, we used to log this metric at an early
stage where refill could still be aborted and not happen.

This CL fixes this by moving the logging till after the refill happens
and distinguishing between address and credit card event logging. Note
that the two functions still run the same logic, but it is now less
confusing.

Bug: 1517894
Change-Id: Iaca8193d12b8a8583b2d851c0195d0d536e827a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5211032
Reviewed-by: Florian Leimgruber <fleimgruber@google.com>
Commit-Queue: Jihad Hanna <jihadghanna@google.com>
Cr-Commit-Position: refs/heads/main@{#1250212}