[FLEDGE] Move histogram recording from AuctionRunner to Auction.

Bug: 1288865
Change-Id: I5ac99daebb34c3221cf217318a130aa44cfb2ce4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3446241


Reviewed-by: Maks Orlovich <morlovich@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/main@{#968351}