Add # sage_setup: distribution directives to all files #4575

Job	Run time
List changed packages	1m 40s
site / linux (gentoo-python3.11, standard-sitepackages)	30m 10s
test / linux (ubuntu-focal, standard)	11m 57s
site / linux (archlinux-latest, standard-sitepackages)	10m 59s
test / linux (ubuntu-focal, minimal)	12m 6s
test / linux (ubuntu-noble, standard)	12m 55s
test / linux (ubuntu-noble, minimal)	9m 37s
test / linux (debian-bullseye, standard)	10m 2s
test / linux (debian-bullseye, minimal)	9m 43s
test / linux (debian-bookworm, standard)	9m 25s
test / linux (debian-bookworm, minimal)	9m 46s
test / linux (fedora-30, standard)	18m 10s
test / linux (fedora-30, minimal)	13m 11s
test / linux (fedora-40, standard)	11m 48s
test / linux (fedora-40, minimal)	21m 19s
test / linux (gentoo-python3.11, standard)	18m 16s
test / linux (gentoo-python3.11, minimal)	15m 51s
test / linux (debian-bullseye-i386, standard)	1h 20m 28s
test / linux (debian-bullseye-i386, minimal)	1h 47m 1s
	6h 54m 24s

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