NXP backend: Improve test result gathering (#20024) #14120

Job	Run time
Get changed files / get-changed-files	5s
CI run decision / decide	31s
test-models-cuda	0s
unittest-cuda	0s
export-model-cuda-artifact	-1s
test-model-cuda-e2e	-1s
check-all-cuda-builds	-1s
test-cuda-pybind	-1s
test-executorch-cuda-build-${{ matrix.cuda-version }}	-1s
	31s

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