chg: dev: Use lists of expected artifacts in system tests

``clean.sh`` scripts have been replaced by lists of expected artifacts for each system test module. The list is defined using the custom ``pytest.mark.extra_artifacts`` mark, which can use both filenames and globs.

Closes #4261

Merge branch '4261-add-pytest-fixture-checking-test-artifacts' into 'main'

See merge request isc-projects/bind9!9426