Add AutofillIgnoreInvalidCountryOnImport to field trial config.

Bug: 1362472
Change-Id: I4cdfc8d272b3162d50b11cd180ee765e8ee2e23e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4030138


Auto-Submit: Florian Leimgruber <fleimgruber@google.com>
Reviewed-by: Matthias Körber <koerber@google.com>
Commit-Queue: Matthias Körber <koerber@google.com>
Cr-Commit-Position: refs/heads/main@{#1072148}