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This also add check to ensure that legacy system health stories which already
have a newer version must be disabled within smoke testing.

Finally, this CL also shorten the names used in _DISABLED to simplify the job of
disabling a system health story.

Bug: 878390, 893615
Change-Id: Ife447c9e5935c960ea7e1818adfcaef0ccaeb59a
Reviewed-on: https://chromium-review.googlesource.com/c/1289686Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#600987}