fix(@angular-devkit/architect): Add boolean type inference for 'true'… #2923

Job	Run time
list	24s
workflow (build-unit-tests)	4m 21s
workflow (modules-builder-tests)	1m 48s
workflow (devkit-core-tests-rerun)	1m 34s
workflow (devkit-core-tests)	1m 30s
workflow (build-cli)	1m 39s
	11m 16s

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