[ExecuTorch][WebGPU] Flatten landed-op test dirs to test/ops/test_<op>.py

[JulianCloudNTH]

Stack from ghstack (oldest at bottom):

• -> [ExecuTorch][WebGPU] Flatten landed-op test dirs to test/ops/test_<op>.py #20435
• [ExecuTorch][WebGPU] cat op test suite (cases.py op-test framework) #20399
• [ExecuTorch][WebGPU] Add cat op + ValueList graph support (aten.cat.default) #20398
• [ExecuTorch][WebGPU] permute_copy op test suite (cases.py op-test framework) #20397
• [ExecuTorch][WebGPU] Add permute_copy + IntList graph support (aten.permute_copy.default) #20396
• [ExecuTorch][WebGPU] slice_copy op test suite (cases.py op-test framework) #20395
• [ExecuTorch][WebGPU] Add slice_copy op (aten.slice_copy.Tensor) #20394
• [ExecuTorch][WebGPU] squeeze_copy + unsqueeze_copy test suites (cases.py op-test framework) #20393
• [ExecuTorch][WebGPU] Add squeeze_copy + unsqueeze_copy (flat copies) #20392
• [ExecuTorch][WebGPU] sigmoid op test suite (cases.py op-test framework) #20391
• [ExecuTorch][WebGPU] Add sigmoid op (aten.sigmoid.default) #20390
• [ExecuTorch][WebGPU] select_copy op test suite (cases.py op-test framework) #20363
• [ExecuTorch][WebGPU] Add select_copy op (aten.select_copy.int) #20362
• [ExecuTorch][WebGPU] view_copy op test suite (cases.py op-test framework) #20361
• [ExecuTorch][WebGPU] Add view_copy op (aten.view_copy.default) #20360
• [ExecuTorch][WebGPU] mul op test suite (cases.py op-test framework) #20359

Pure test-file relocation: moves the already-landed ops' tests from nested test/ops/<op>/test_<op>.py to flat test/ops/test_<op>.py, matching the ExecuTorch convention (XNNPACK uses flat test/ops/test_<op>.py; Vulkan uses flat test/test_*.py) and completing the flatten applied to the new ops in the stack below. Drops the per-op __init__.py; the parent test/ops/__init__.py is kept. Ops: add, rms_norm, sdpa (test_sdpa + test_update_cache), dispatch_order, quantized_linear, embedding_q4gsw, rope, prepack.

No behavior change — the test modules and their export/golden functions are unchanged; only their path moves. Every reference to the old paths is updated: the cases.py op-test imports (add, rms_norm), test/TARGETS (test_add srcs), test/ops/test_dispatch_order.py's internal rms_norm import, and the build/CI scripts that import the per-op export functions (test/test_build_webgpu.sh, scripts/test_webgpu_native_ci.sh).

Nothing required the per-op subdirectory: the codegen framework imports only cases.py, the one buck target uses a literal path, and the native-golden scripts import the modules by path — each resolves identically at the flat path.
@exported-using-ghexport

Differential Revision: D109349894

Differential Revision: D109349894

[pytorch-bot]

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• [ROCm] MI350 CI jobs will have longer queue times due to CI migration

❌ 4 New Failures, 4 Unrelated Failures

As of commit 1002b80 with merge base 65bc0ca ():

NEW FAILURES - The following jobs have failed:

• pull / test-arm-backend-no-driver (test_pytest_ops_tosa) / linux-job (gh)
  RuntimeError: Command docker exec -t 59ab1780450c4a16007894e8483caf576b30ae23fa5c93dfe79074bbcc51e05c /exec failed with exit code 1
• pull / test-qnn-models-linux (dl3) / linux-job (gh)
  RuntimeError: Command docker exec -t a40a29db650250c4b62310eb53d5bec50f629b5087272c86f14ffd4879b3a4c9 /exec failed with exit code 92
• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 4ffdc5a31f9cdb60ee87d2910fdd77c0b07b4082f85a01335d8be13f7d6df787 /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 36f44c2e9e02422d7434d2676743880a5012f9954c89972928fc8f95589c6379 /exec failed with exit code 1

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-qnn-testsuite-linux / test-backend-linux (qnn, models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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

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

• pull / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh) (trunk failure)
• pull / unittest / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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