chore: move Tests.v to test/ folder #1537

Job	Run time
nix	3m 27s
build (supported)	3m 50s
build (latest)	4m 58s
build (dev, --warnings)	4m 57s
opam-build (supported, ubuntu-latest)	4m 58s
opam-build (8.17, ubuntu-latest)	5m 1s
opam-build (latest, ubuntu-latest)	4m 57s
opam-build (dev, ubuntu-latest)	4m 58s
quick-build (supported, ubuntu-latest)	3m 46s
quick-build (latest, ubuntu-latest)	3m 52s
quick-build (dev, ubuntu-latest)	4m 16s
doc-dep-graphs	1s
doc-alectryon	1s
coqchk	1s
doc-coqdoc	1s
doc-timing	1s
install	1s
deploy-doc	1s
delete-artifacts	3s
	49m 10s

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