Adds CliRunner.ListAreaIdsByNamePrefixAsync so Playwright tests can locate
and delete areas they created through the UI without needing the id returned
from a CLI create call. Mirrors ListTemplateIdsByNamePrefixAsync. Round-trip
test verifies create → list-by-prefix → delete against the live cluster.
Also extends AddAttributeAsync with an optional dataSourceReference parameter
so the fixture attribute appears in both _bindingDataSourceAttrs (bindings UI)
and _overrideAttrs (overrides UI) on the InstanceConfigure page.
Joseph Doherty