acc: Make run_as/job_default test run only on direct

[andrewnester]

Changes

Make run_as/job_default test run only on direct

Why

This test on TF causes a permanent drift and differnce in the output. But for this test there is not real reason to run it on both direct and TF.
See the difference (source field is included) here:

https://github.com/databricks-eng/eng-dev-ecosystem/actions/runs/24552546859/job/71781373042

 --- bundle/run_as/job_default/output.txt
          +++ /tmp/TestAcceptbundlerun_asjob_defaultDATABRICKS_BUNDLE_ENGINE=te1133212625/001/output.txt
          @@ -33,7 +33,8 @@
                     "spark_version": "13.3.x-snapshot-scala2.12"
                   },
                   "notebook_task": {
          -          "notebook_path": "/Workspace/Users/[USERNAME]/.bundle/run_as_job_default/default/files/test"
          +          "notebook_path": "/Workspace/Users/[USERNAME]/.bundle/run_as_job_default/default/files/test",
          +          "source": "***"
                   },
                   "task_key": "task_one"
                 }

Tests

[github-actions]

Waiting for approval

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Round-robin suggestion: @lennartkats-db

Eligible reviewers: @anton-107, @denik, @janniklasrose, @lennartkats-db, @pietern, @shreyas-goenka

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