CI Tests for Zephyr Integration

[BujSet]

Summary

Adding in CI tests to verify and maintain support for Zephyr projects that build executorch as a module. The main zephyr application source code is hosted externally for now, but the process to host an Executorch as an official module of zephyr is in progress.

This PR runs the simple Add model as unit tests, and verifies that the output is 2 (1D tensor + 1D tensor, values filled with 1s). This is intended to be a simple and fast test to exemplify how to use executorch to build an executor_runner for other models.

Test plan

[PLEASE REMOVE] How did you test this PR? Please write down any manual commands you used and note down tests that you have written if applicable.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12734

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

⏳ 39 Pending, 8 Unrelated Failures

As of commit 03b8695 with merge base bc0ad82 ():

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• trunk / test-models-linux-aarch64 (add_mul, xnnpack-quantization-delegation, linux.arm64.2xlarge) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128
• trunk / test-models-linux-aarch64 (emformer_transcribe, xnnpack-quantization-delegation, linux.arm64.2xla... / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 1
• trunk / test-models-linux-aarch64 (ic3, xnnpack-quantization-delegation, linux.arm64.2xlarge) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 1
• trunk / test-models-linux-aarch64 (llama3_2_vision_encoder, portable, linux.arm64.2xlarge) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128
• trunk / test-models-linux-aarch64 (mobilebert, portable, linux.arm64.2xlarge) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128
• trunk / test-models-linux-aarch64 (resnet50, portable, linux.arm64.2xlarge) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 1
• trunk / test-models-linux-aarch64 (softmax, portable, linux.arm64.2xlarge) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 1

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

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

• trunk / test-models-linux-aarch64 (linear, xnnpack-quantization-delegation, linux.arm64.2xlarge) / linux-job (gh) (trunk failure)
  The process '/usr/bin/git' failed with exit code 1

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[BujSet]

@pytorchbot label "release notes: none"