Various CI and doc refactors #3221

Job	Run time
configure	14s
analysis / base / assert-no-changes	14s
analysis / target / preview-new-changes	12m 53s
analysis / base / preview-new-changes	16s
analysis / target / assert-no-changes	12m 27s
compare / assert-no-changes	18s
compare / preview-new-changes	20s
comment	12s
	26m 54s

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