chore: HoTT.Tests -> HoTT_Tests, HoTT.Contrib -> HoTT_Contrib #3951

Job	Run time
nix	2m 13s
quick-build (9.0, ubuntu-latest)	3m 8s
quick-build (dev, ubuntu-latest)	3m 20s
opam-build (9.1, ubuntu-latest)	3m 50s
quick-build (9.1, ubuntu-latest)	3m 12s
build (dev, --warnings)	3m 50s
opam-build (9.0, ubuntu-latest)	3m 57s
build (9.0)	3m 15s
build (9.1)	3m 13s
opam-build (dev, ubuntu-latest)	3m 49s
install (9.0)	1m 41s
doc-timing	1m 37s
install (9.1)	1m 39s
install (dev)	1m 53s
doc-alectryon	10m 36s
coqchk (9.1)	1m 36s
coqchk (9.0)	1m 48s
doc-coqdoc	1m 35s
doc-dep-graphs	7m 38s
coqchk (dev)	1m 56s
delete-artifacts	10s
deploy-doc	1s
	1h 5m 57s

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