refactor(@schematics/angular): replace devkit path functions with nod… #1871

Job	Run time
lint	2m 15s
build	25s
build-e2e-windows	17s
e2e-windows	0s
test	0s
Browser Compatibility Tests	0s
publish-snapshots	0s
e2e-package-managers	0s
e2e	0s
e2e-snapshots	0s
	2m 57s

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