Tests

Minor changes required for new-style Charm Design usage #958

Job	Run time
Lint	18s
Unit tests (2.9.42.4)	19s
Unit tests (3.2.0.1)	16s
Build charms / Get workflow version / Get workflow version	2s
Build charms / Collect charms	10s
Build charms / Build data-platform-libs charm \| 22.04	1m 26s
Build charms / Build database charm \| 22.04	1m 29s
Build charms / Build s3-app charm \| 20.04	1m 19s
Build charms / Build kafka charm \| 22.04	1m 27s
Build charms / Build opensearch charm \| 22.04	1m 20s
Build charms / Build app charm \| 22.04	1m 23s
Build charms / Build application charm \| 22.04	1m 33s
Build charms / Build secrets-test charm \| 22.04	1m 19s
integration-database Juju 2.9/stable -- libjuju 2.9.42.4	12m 46s
integration-database Juju 3.1/stable -- libjuju 3.2.2	13m 49s
integration-s3 Juju 2.9/stable -- libjuju 2.9.42.4	10m 19s
integration-s3 Juju 3.1/stable -- libjuju 3.2.2	11m 49s
integration-opensearch Juju 2.9/stable -- libjuju 2.9.42.4	7m 12s
integration-opensearch Juju 3.1/stable -- libjuju 3.2.2	7m 26s
integration-kafka Juju 2.9/stable -- libjuju 2.9.42.4	8m 36s
integration-kafka Juju 3.1/stable -- libjuju 3.2.2	8m 26s
integration-upgrades Juju 3.1/stable -- libjuju 3.2.2	9m 57s
integration-secrets Juju 3.1/stable -- libjuju 3.2.2	7m 27s
	1h 50m 8s

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