Let longevity runner mark test as attempted before running it.

Please see associated bug for details. This is due to a multi-threading
issue. This is a band-aid that should work most of the time, but might
require further investigation.

Bug: 131256838
Test: LongevityPlatformLibTests (still pass)
Change-Id: I5a73b34040a8df7953af13022d84e9f24c7634fd
(cherry picked from commit 8532ee7867a1dc7de6e0e010d2b4c467367aafad)