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In order to better understand the feedback reports, adding logging in key events of arc provisioning process.

BUG=b:162221783
TEST=deploy to dut, disable playstore, re-enable playstore, successfully
finish the authorization flow

Change-Id: Ie6cd8a4dd9b89353a0a3fa1dcc656496f62bfb07
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2365997Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Commit-Queue: Muhammad Hasan Khan <mhasank@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800319}