Deprecate stack-yaml input #223

Job	Run time
test-generate	2s
test (ubuntu-latest, nightly)	29s
test (ubuntu-latest, lts)	34s
test (ubuntu-latest, lts-22.7, 9.6.4)	30s
test (ubuntu-latest, lts-12.26, 8.4.4)	22s
test (macOS-latest, nightly)	1m 43s
test (macOS-latest, lts)	1m 5s
test (macOS-latest, lts-22.7, 9.6.4)	1m 33s
test (macOS-latest, lts-12.26, 8.4.4)	58s
test (windows-latest, nightly)	2m 15s
test (windows-latest, lts)	2m 17s
test (windows-latest, lts-22.7, 9.6.4)	2m 15s
test (windows-latest, lts-12.26, 8.4.4)	2m 16s
test-stack-yamls (stack-nightly.yaml)	26s
test-stack-yamls (stack.yaml)	24s
	17m 9s

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