Various CI and doc refactors #3218

Job	Run time
configure	13s
analysis / target / assert-no-changes	9m 28s
analysis / target / preview-new-changes	12m 44s
analysis / base / preview-new-changes	18s
analysis / base / assert-no-changes	14s
compare / preview-new-changes	21s
compare / assert-no-changes	21s
comment	12s
	23m 51s

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