Add visual test for ScatterRegionLayerArtist #577

Job	Run time
initial_checks / Load tox environments	7s
initial_checks / codestyle (ubuntu-latest)	27s
tests / Load tox environments	8s
tests / py38-test-lts-all (ubuntu-latest)	1m 26s
tests / py39-test (ubuntu-latest)	1m 46s
tests / py310-test-all (ubuntu-latest)	1m 51s
tests / py311-test (ubuntu-latest)	2m 39s
tests / py311-test-all (ubuntu-latest)	1m 28s
tests / py38-docs (ubuntu-latest)	4m 9s
tests / py311-docs (macos-latest)	6m 4s
tests / py38-test-all (macos-latest)	2m 31s
tests / py39-test (macos-latest)	2m 18s
tests / py310-test-all (macos-latest)	2m 2s
tests / py311-test (macos-latest)	3m 14s
tests / py38-test (windows-latest)	3m 34s
tests / py310-test (windows-latest)	3m 45s
tests / py310-test-dev-all (ubuntu-latest)	1m 54s
tests / py311-test-dev (ubuntu-latest)	2m 27s
publish / Build source and wheel distribution	4m 41s
	46m 31s

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