PSM: Remove PSM vs Hash dance helper testing functions

As previously both protocols were running sequentially,
we were testing their comparison results against each other.

At the moment, PSM is the only source of truth for initial
enrollment, and these functions are not being used at all and
can be simply removed.

Bug: 1242309
Change-Id: Ib4c74bccde826b347df991489be258ef4ad04f84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3116746


Commit-Queue: Maksim Ivanov <emaxx@chromium.org>
Auto-Submit: Amr Aboelkher <amraboelkher@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/main@{#915143}