Maint: parc.find_regions as module method. clarify find_regions #3089

Job	Run time
use-custom-cfg	5s
lint / lint	10s
e2e-tests-fast	0s
unit-tests-fast	0s
unit-tests-full (3.10) / unit-tests	6m 8s
test-examples / test_examples	22m 9s
unit-tests-full (3.11) / unit-tests	6m 15s
unit-tests-full (3.12) / unit-tests	6m 11s
unit-tests-full (3.7) / unit-tests	5m 1s
unit-tests-full (3.8) / unit-tests	4m 57s
check-importable (3.10) / check-importable	32s
check-importable (3.11) / check-importable	37s
check-importable (3.12) / check-importable	37s
check-importable (3.7) / check-importable	31s
check-importable (3.8) / check-importable	25s
unit-tests-full (3.9) / unit-tests	4m 18s
e2e-tests-full (3.10) / e2e	1h 46m 11s
check-importable (3.9) / check-importable	28s
e2e-tests-full (3.11) / e2e	1h 47m 38s
e2e-tests-full (3.12) / e2e	1h 51m 50s
e2e-tests-full (3.7) / e2e	2h 23m 56s
e2e-tests-full (3.8) / e2e	1h 57m 43s
e2e-tests-full (3.9) / e2e	1h 56m 54s
	12h 42m 36s

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