refactor(@angular-devkit/architect): correct misused promises lint fa… #2278

Job	Run time
list	24s
workflow (modules-builder-tests)	1m 39s
workflow (build-cli)	1m 36s
workflow (build-unit-tests)	2m 19s
workflow (devkit-core-tests)	1m 15s
workflow (devkit-core-tests-rerun)	1m 19s
	8m 32s

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