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Most of the changes in the CL is moving methods from
OobeInteractiveUITest to standalone functions.

Bug: none

Change-Id: I460434d81d697151acf9d5fe2e4097a8a76a8534
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1616450Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661148}