Exynosbackend e2e test

[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.

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15731

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:x: 4 New Failures

As of commit 1c8c7537bbc37090c826cb983a08383fa58c59a6 with merge base b7dc758833914afd689f7b217b8b9a414aa6e0ff ():

NEW FAILURES - The following jobs have failed:

• pull / android / build-llm-demo / linux-job (gh) At least one of the pre-conditions you specified did not hold
• pull / test-openvino-linux / linux-job (gh) RuntimeError: Command docker exec -t 04cd7636bcaa6543dd56980777045306f1af98fe8d7544bbc540132178ef933e /exec failed with exit code 1
• pull / test-samsung-models-linux / linux-job (gh) RuntimeError: Command docker exec -t 57aaf1188f1e078d70d8acb0dc2fff5646aaa71157812bf78033bee711db3d33 /exec failed with exit code 1
• pull / test-samsung-quantmodels-linux / linux-job (gh) RuntimeError: Command docker exec -t ce2c7e7c55c9eb0fb988d6194169bf572b180559eb6d0b3ea679097f0c528fd2 /exec failed with exit code 1

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