Deprecate stack-yaml input #221

Job	Run time
test-generate	2s
test (ubuntu-latest, nightly)	6m 6s
test (ubuntu-latest, lts)	5m 50s
test (ubuntu-latest, lts-22.7, 9.6.4)	5m 47s
test (ubuntu-latest, lts-12.26, 8.4.4)	4m 46s
test (macOS-latest, nightly)	1m 6s
test (macOS-latest, lts)	3m 43s
test (macOS-latest, lts-22.7, 9.6.4)	11m 25s
test (macOS-latest, lts-12.26, 8.4.4)	6m 58s
test (windows-latest, nightly)	8m 41s
test (windows-latest, lts)	10m 35s
test (windows-latest, lts-22.7, 9.6.4)	10m 32s
test (windows-latest, lts-12.26, 8.4.4)	10m 11s
test-stack-yamls (stack-nightly.yaml)	5m 55s
test-stack-yamls (stack.yaml)	4m 49s
	1h 36m 26s

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