build: remove `build-schema` script #2497

Job	Run time
list	20s
workflow (build-unit-tests)	2m 26s
workflow (modules-builder-tests)	1m 51s
workflow (devkit-core-tests)	1m 17s
workflow (devkit-core-tests-rerun)	1m 27s
workflow (build-cli)	1m 41s
	9m 2s

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