[Backend Tester] Add tests for activation functions

[GregoryComer]

No description provided.

[GregoryComer]

Stack from ghstack (oldest at bottom):

• -> [Backend Tester] Add tests for activation functions #11961
• [Backend Tester] Add compliance suite skeleton and operator tests #11960
• [Backend Tester] Add CoreML tester implementation #11959
• [Backend Tester] Add FACTO operator test skeleton #11953

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/11961

• 📄 Preview Python docs built from this PR

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❌ 5 New Failures

As of commit 714411b with merge base 91c9ffa ():

NEW FAILURES - The following jobs have failed:

• Build Presets / linux (pybind, linux.2xlarge, executorch-ubuntu-22.04-clang12) / build (gh)
• Lint / link-check / lint-urls / linux-job (gh)
• Lint / lintrunner / linux-job (gh)
  >>> Lint for backends/test/compliance_suite/operators/test_threshold.py:
• pull / unittest-buck / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 7d378ae6617e2b3463d32340df356df48862c74d6d1b802ab8f41b1468bd4285 /exec failed with exit code 3
• pull / unittest-buck / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 3

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