V2 quantizer: fix IO-boundary shared clusters left in float (#20291) #14071

Job	Run time
Get changed files / get-changed-files	6s
CI run decision / decide	30s
export-model-cuda-artifact	-1s
test-executorch-cuda-build-${{ matrix.cuda-version }}	-1s
test-models-cuda	-1s
unittest-cuda	-1s
test-model-cuda-e2e	-1s
test-cuda-pybind	-1s
check-all-cuda-builds	-1s
	29s

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