refactor: restructure to match RFC-140 #187

Job	Run time
build-attributes / attribute-matrix	1m 5s
build-attributes / attribute-matrix	50s
build-attributes / aarch64-darwin.darwin-system-fixture	3m 2s
build-attributes / aarch64-darwin.darwin-system-fixture	17m 22s
build-attributes / aarch64-darwin.devshell-rosetta	3m 20s
build-attributes / aarch64-darwin.devshell-rosetta	10m 39s
build-attributes / aarch64-darwin.pre-commit	1m 59s
build-attributes / aarch64-darwin.pre-commit	1m 42s
build-attributes / x86_64-linux.devshell-rosetta	3m 47s
build-attributes / x86_64-linux.devshell-rosetta	18m 57s
build-attributes / x86_64-linux.pre-commit	1m 16s
build-attributes / x86_64-linux.pre-commit	1m 13s
build-attributes / collect	1s
build-attributes / collect	1s
	1h 5m 14s

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