archutil: refactor generation and validation #6860

Job	Run time
prepare	5s
archutil-arm64	3m 22s
validate (lint-default)	12m 34s
validate (lint-labs)	12m 14s
validate (lint-nydus)	12m 26s
validate (lint-proto)	31s
validate (lint-yaml)	20s
validate (validate-archutil)	38s
validate (validate-docs)	44s
validate (validate-doctoc)	18s
validate (validate-generated-files)	39s
validate (validate-shfmt)	23s
validate (validate-vendor)	30s
	44m 44s

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