Add visual test for ScatterRegionLayerArtist #578

Job	Run time
initial_checks / Load tox environments	6s
initial_checks / codestyle (ubuntu-latest)	27s
tests / Load tox environments	6s
tests / py38-test-lts-all (ubuntu-latest)	1m 53s
tests / py39-test (ubuntu-latest)	2m 2s
tests / py310-test-all (ubuntu-latest)	1m 54s
tests / py311-test (ubuntu-latest)	1m 20s
tests / py311-test-all (ubuntu-latest)	1m 44s
tests / py38-docs (ubuntu-latest)	4m 15s
tests / py311-docs (macos-latest)	7m 8s
tests / py38-test-all (macos-latest)	2m 43s
tests / py39-test (macos-latest)	2m 55s
tests / py310-test-all (macos-latest)	2m 20s
tests / py311-test (macos-latest)	1m 53s
tests / py38-test (windows-latest)	2m 47s
tests / py310-test (windows-latest)	2m 48s
tests / py310-test-dev-all (ubuntu-latest)	2m 41s
tests / py311-test-dev (ubuntu-latest)	2m 22s
publish / Build source and wheel distribution	2m 55s
	44m 19s

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