Fix KeyError in InsertIOQDQ pass for LLM quantization #7754

Job	Run time
unittest-cuda / linux-job	24m 46s
test-executorch-cuda-build-12.6 / linux-job	19m 45s
test-executorch-cuda-build-13.0 / linux-job	19m 4s
test-models-cuda (mv2) / linux-job	25m 23s
test-models-cuda (resnet18) / linux-job	22m 41s
test-models-cuda (linear) / linux-job	22m 8s
test-models-cuda (add) / linux-job	21m 58s
test-models-cuda (sdpa) / linux-job	22m 1s
export-model-cuda-artifact	0s
test-models-cuda (add_mul) / linux-job	22m 3s
test-models-cuda (mv3) / linux-job	25m 44s
test-executorch-cuda-build-12.9 / linux-job	22m 13s
test-models-cuda (conv1d) / linux-job	22m 41s
test-executorch-cuda-build-12.8 / linux-job	19m 32s
test-model-cuda-e2e	0s
check-all-cuda-builds	2s
	4h 50m 1s

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