Determine if the build is in presubmit using build id

The current logic to determine if a build is pre or postsubmit is the
existence of the change_info file but this file also exists in
postsubmit, causing the build to break. Use the build ID as the
heuristic instead which should be more reliable.

Test: abtd run
Bug: 314171817
Change-Id: I9871eee71c0574583b528135dadd42e3f485a780