Add a license check in the Scheduling worker itself

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The following discussion from !146475 (merged) should be addressed:

• @terrichu started a discussion: (+2 comments)

  question (non-blocking): I wonder if there needs to be license and/or feature flag gates in this class (or in the calling CRON Zoekt::SchedulingWorker)? I see the cron worker has a beta flag though, so leaving this as a non-blocking to see what y'all think