Add a very basic regression test for Sphinx domain cross-references #782

Job	Run time
check	18s
Ubuntu / 3.12 regression tests	8m 15s
check_docs	49s
MacOS / 3.12 regression tests	10m 9s
Ubuntu / 3.8 unit tests	1m 16s
build_docs	6m 29s
Ubuntu / 3.9 unit tests	1m 12s
Windows / 3.12 regression tests	14m 58s
Ubuntu / 3.10 unit tests	1m 12s
Ubuntu / 3.8 regression tests	6m 44s
Ubuntu / 3.11 unit tests	1m 14s
Ubuntu / 3.10 regression tests	6m 12s
Ubuntu / 3.12 unit tests	1m 17s
Ubuntu / 3.11 regression tests	7m 6s
Ubuntu / 3.13.0-alpha - 3.13 unit tests	1m 43s
Ubuntu / 3.13.0-alpha - 3.13 regression tests	8m 13s
Ubuntu / pypy-3.9 unit tests	1m 58s
Ubuntu / pypy-3.9 regression tests	17m 29s
MacOS / 3.8 unit tests	1m 22s
Ubuntu / 3.12 regression tests (docutils)	14m 10s
MacOS / 3.9 unit tests	1m 14s
Ubuntu / 3.12 regression tests (Sphinx)	15m 44s
MacOS / 3.10 unit tests	52s
Ubuntu / 3.9 regression tests (Sphinx)	2m 11s
MacOS / 3.11 unit tests	40s
MacOS / 3.12 unit tests	41s
MacOS / 3.13.0-alpha - 3.13 unit tests	34s
MacOS / pypy-3.9 unit tests	1m 30s
Windows / 3.8 unit tests	1m 38s
Windows / 3.9 unit tests	2m 29s
Windows / 3.10 unit tests	1m 54s
Windows / 3.11 unit tests	1m 50s
Windows / 3.12 unit tests	2m 1s
Windows / 3.13.0-alpha - 3.13 unit tests	2m 16s
Windows / pypy-3.9 unit tests	3m 8s
Ubuntu / 3.12 unit tests (Sphinx)	6m 51s
Ubuntu / 3.9 unit tests (Sphinx)	1m 3s
Update docs versions JSON	11s
check-tag	0s
publish-release	0s
publish-develop	0s
	2h 38m 53s

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