Configuration of the timespan of the items to include in
scanning. Currently only supported when inspecting Google Cloud Storage
and BigQuery.
Exclude files or rows newer than this value. If set to zero,
no upper time limit is applied.
When the job is started by a JobTrigger we will automatically
figure out a valid start_time to avoid scanning files that
have not been modified since the last time the JobTrigger
executed. This will be based on the time of the execution of
the last run of the JobTrigger.
