Fix flaky test: Use setSkipWorkerJobs

[gillespi314]

Related issue: Resolves #38898

Looking at the logs from the issue, we see that the command to install fleetd is being sent twice, which indicates the worker job ran twice. Speculative fix to setSkipWorkerJobs was validated with RandoKiller™.

2026-01-27T16:57:48.2528634Z {"host_uuid":"09A54077-7060-43FB-9E97-7EC4F8EFD248","info":"sent command to install fleetd"}
2026-01-27T16:57:48.2574915Z {"host_uuid":"09A54077-7060-43FB-9E97-7EC4F8EFD248","info":"unable to find a bootstrap package for DEP enrolled device, skipping installation"}
2026-01-27T16:57:48.2735754Z     integration_mdm_test.go:944: [awaitTriggerProfileSchedule] Starting profile schedule trigger at 2026-01-27T16:57:48Z
2026-01-27T16:57:48.2742390Z     integration_mdm_test.go:948: [awaitTriggerProfileSchedule] Triggering profile schedule...
2026-01-27T16:57:48.2784612Z     integration_mdm_test.go:964: [awaitTriggerProfileSchedule] Waiting for 3 jobs to complete...
2026-01-27T16:57:48.2792241Z {"instanceID":"TestIntegrationsMDM","level":"debug","msg":"done, trigger received","schedule":"mdm_apple_profile_manager"}
2026-01-27T16:57:48.2809898Z {"host_uuid":"09A54077-7060-43FB-9E97-7EC4F8EFD248","info":"sent command to install fleetd"}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.18%. Comparing base (39f9518) to head (d2db0b7).
⚠️ Report is 28 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #39106   +/-   ##
=======================================
  Coverage   66.18%   66.18%           
=======================================
  Files        2423     2423           
  Lines      194078   194078           
  Branches     8518     8518           
=======================================
+ Hits       128452   128453    +1     
  Misses      53947    53947           
+ Partials    11679    11678    -1     

Flag	Coverage Δ
backend	67.95% <ø> (+<0.01%)	⬆️

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