Enable E2E test for Exynos Backend

[Jiseong-oh]

Summary

Enable E2E test for the Exynos backend.
Modify it to run the testing using a device from devicefarm that can be used directly in CI.

Test plan

Each test case was verified on a real device.

cc @SS-JIA @digantdesai @kimishpatel

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15245

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❌ 7 New Failures, 1 Cancelled Job, 6 Unrelated Failures

As of commit 4b608c1 with merge base dbdeb49 ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner / linux-job (gh)
  >>> Lint for backends/samsung/test/utils/runtime_executor.py:
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t d0967c9998277a3244b91ba1f4cb81b47eeabaabbc2db216b30236ad78f922c0 /exec failed with exit code 1
• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh)
  RuntimeError: Command docker exec -t ecb288a6d7724714e6ee45e00661f3fea8b2cd74b25fe05d65ffafae00ac9a1f /exec failed with exit code 1
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t 5231cddd250a8b63d6f45224446d068a4af47d290e61922b5a16b16a183e2803 /exec failed with exit code 1
• Test CUDA Builds / export-voxtral-cuda-artifact / linux-job (gh)
  RuntimeError: Command docker exec -t 13a5501e2af8687751f937dcefd71070a4d5925739311cbf92806d92c5901cd8 /exec failed with exit code 2
• trunk / test-arm-backend (test_pytest_models_ethosu_fvp) / linux-job (gh)
  RuntimeError: Command docker exec -t e1067263274c8c196d838df9984979d986824c714a92175ac651ce39596c68e4 /exec failed with exit code 1
• trunk / test-llama-runner-mac (fp32, coreml) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

CANCELLED JOB - The following job was cancelled. Please retry:

• pull / test-openvino-linux / linux-job (gh)

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / android / run-emulator (gh) (trunk failure)
  The process '/usr/bin/sh' failed with exit code 255
• pull / test-binary-size-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-setup-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest / linux / linux-job (gh) (trunk failure)
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
• trunk / unittest-release / linux / linux-job (gh) (trunk failure)

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