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The policy value creation login is currently duplicated in the tests
that need to set DeviceMinimumVersion policy. This CL extract that
logic along with other common elements into a test helper class that
could be used by multiple test classes.

This test helper class would also be useful when the update required
notification unit tests are extracted into a separate unit test class
which should be placed closer to
c/b/chromeos/ui/update_required_notification.cc.

Bug: 1128413
Change-Id: I0952c9c4f99af348e6de40154b57cf2a777ef07a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410255
Commit-Queue: Saurabh Nijhara <snijhara@google.com>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807435}