Upgrade xplat/executorch to Python Scientific Stack 3 #6143

Job	Run time
unittest-cuda / linux-job	24m 49s
test-models-cuda (linear) / linux-job	21m 42s
test-models-cuda (add_mul) / linux-job	21m 35s
test-executorch-cuda-build-12.6 / linux-job	19m 27s
test-models-cuda (resnet18) / linux-job	22m 25s
test-models-cuda (sdpa) / linux-job	21m 37s
test-models-cuda (conv1d) / linux-job	21m 41s
test-models-cuda (add) / linux-job	21m 35s
test-executorch-cuda-build-12.9 / linux-job	21m 29s
test-executorch-cuda-build-12.8 / linux-job	20m 21s
test-executorch-cuda-build-13.0 / linux-job	18m 31s
test-model-cuda-e2e	0s
export-model-cuda-artifact	0s
check-all-cuda-builds	4s
	3h 55m 16s

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