build: refactor ng_package substitutions #61

Job	Run time
lint	2m 30s
build	16s
build-e2e-windows	18s
test	0s
publish-snapshots	0s
e2e-snapshots	0s
Browser Compatibility Tests	0s
e2e	0s
e2e-package-managers	-1s
e2e-windows	-1s
	3m 2s

Provide feedback