Add more CI testcases for Exynos Backend

[Jiseong-oh]

Summary

• Support necessary stages for E2E test
• Enable test for float/quant ops and float models

Test plan

cc @SS-JIA @digantdesai @kimishpatel

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18664

• 📄 Preview Python docs built from this PR

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❌ 3 New Failures, 2 Unrelated Failures

As of commit b2dc642 with merge base 3a6314e ():

NEW FAILURES - The following jobs have failed:

• pull / test-mcu-cortex-m-backend / linux-job (gh)
  RuntimeError: Command docker exec -t 81426f67dc97477da907f942fb1827654c253d95d2b7ea6eaf217eb76efa38fc /exec failed with exit code 1
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 73cb53f5e3433bc11fd15e0b98777962d4018139204689983458f88a084164dd /exec failed with exit code 137
• pull / unittest / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_conv2d.py::TestConv2d::test_fp16_conv2d

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

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

• pull / unittest / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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