Deprecate stack-yaml input #220

Job	Run time
test-generate	3s
test (ubuntu-latest, nightly)	1m 7s
test (ubuntu-latest, lts)	1m 8s
test (ubuntu-latest, lts-22.7, 9.6.4)	1m 8s
test (ubuntu-latest, lts-12.26, 8.4.4)	1m 8s
test (macOS-latest, nightly)	1m 8s
test (macOS-latest, lts)	1m 10s
test (macOS-latest, lts-22.7, 9.6.4)	1m 3s
test (macOS-latest, lts-12.26, 8.4.4)	1m 4s
test (windows-latest, nightly)	1m 9s
test (windows-latest, lts)	1m 8s
test (windows-latest, lts-22.7, 9.6.4)	1m 6s
test (windows-latest, lts-12.26, 8.4.4)	1m 7s
test-stack-yamls (stack-nightly.yaml)	58s
test-stack-yamls (stack.yaml)	57s
	15m 24s

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