Zephyr: Auto-export models from prj.conf #4396

Job	Run time
test-qnn / test-backend-linux (qnn, models) / linux-job	27m 15s
test-qnn / test-backend-linux (qnn, operators) / linux-job	14m 53s
test-qnn / test-backend-macos	-8s
test-qnn / package-golden-artifacts	2m 22s
	44m 22s

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