Hash dance: Disentangle the FRE tests to be for FRE only

Previously Hash dance was being used for both initial enrollment
and FRE, that's why a lot of test cases were supporting running
for either use case.

At the moment, PSM is the source of truth for initial enrollment
and it has its own intensive test cases coverage. Therefore, it's
possible to remove the entaglement of FRE tests that use Hash
dance to be for FRE only.

This CL is removing the support of running Hash dance test cases
that have different flow for initial enrollment or FRE, and make
them follow the FRE flow only.

Bug: 1242309
Change-Id: I85f8a54d69be83bcdecafdb1ede198d81bc8ed91
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3122183


Commit-Queue: Amr Aboelkher <amraboelkher@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/main@{#915929}