Revisit `metaschema` command tests #313

Job	Run time
test (ubuntu-latest, clang, clang++, sh)	1m 33s
docker	1m 36s
test (ubuntu-latest, gcc, g++, sh)	1m 8s
test (macos-13, clang, clang++, sh)	2m 7s
test (macos-14, clang, clang++, sh)	58s
test (windows-latest, pwsh)	3m 35s
	10m 57s

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