Add test op alias to backend target (#20223)

[JakeStevens]

Summary:

The backend code now uses op alias, which lives in test code and was not a BUCK dependency.

Add the proper deps

Reviewed By: rascani

Differential Revision: D108305486

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20223

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❌ 3 New Failures

As of commit 318cb03 with merge base d0a8dd6 ():

NEW FAILURES - The following jobs have failed:

• Cadence Build & Test / hifi-build / hifi4 (gh)
  Input required and not supplied: aws-region
• Cadence Build & Test / vision-build / vision (gh)
  Input required and not supplied: aws-region
• pull / test-lora-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 37ca932a44cdcf46c16d4220344b7eda21d2f31543ae7126f2152793ead51850 /exec failed with exit code 1

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[meta-codesync]

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