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This CL add unit tests that tests all different scenarios that the
PSM can encounter. That doesn't include tests for PSM + hash dance.

See go/cros-psm-client-unittests-coverage for an overview of the
test cases for the different cases.

BUG=chromium:1136866

Change-Id: I69d16af68fecde5212f362f84ed5bbcb05a971e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2461343
Commit-Queue: Amr Aboelkher <amraboelkher@google.com>
Reviewed-by: Roland Bock <rbock@google.com>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824058}