[Backend Tester] Clean up operators test after pytest migration

[GregoryComer]

No description provided.

[GregoryComer]

Stack from ghstack (oldest at bottom):

• -> [Backend Tester] Clean up operators test after pytest migration #14530
• [Backend Tester] Migrate to pytest #14456

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14530

• 📄 Preview Python docs built from this PR

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✅ No Failures

As of commit 5ce01fe with merge base 56defdf ():
💚 Looks good so far! There are no failures yet. 💚

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[github-actions]

Looks like this PR hasn't been updated in a while so we're going to go ahead and mark this as Stale.
Feel free to remove the Stale label if you feel this was a mistake.
If you are unable to remove the Stale label please contact a maintainer in order to do so.
If you want the bot to never mark this PR stale again, add the no-stale label.
Stale pull requests will automatically be closed after 30 days of inactivity.