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This CL introduces EDUCoexistence ARC Migration
UI. The UI is triggered only in the following scenario:
1. The supervised user has an EDU account on device.
2. The EDU account has not yet been added to ARC++.

Regardless of the number of EDU accounts on the supervised user,
the migration ui will be shown only once.

Bug: 1115313
Change-Id: Ieded997c99be6708bef7d441aa5d07ce3b1cf95e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2360575Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Kush Sinha <sinhak@chromium.org>
Reviewed-by: Aga Wronska <agawronska@chromium.org>
Commit-Queue: Yilkal Abe <yilkal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804047}