build: remove shelljs usage #2155

Job	Run time
list	36s
workflow (devkit-core-tests)	1m 17s
workflow (build-unit-tests)	2m 16s
workflow (build-cli)	1m 31s
workflow (devkit-core-tests-rerun)	1m 23s
workflow (modules-builder-tests)	1m 48s
	8m 51s

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