Tests

Tests #742

Job	Run time
Unit tests	2m 49s
Lint	13s
Check libraries	32s
Build charms / Get workflow version / Get workflow version	5s
Build charms / Collect charms	16s
Build charms / Build mongodb charm \| 22.04	5m 12s
Build charms / Build application charm \| 20.04	2m 39s
charm-integration	12m 52s
ha-integration	58m 2s
relation-integration	20m 37s
legacy-integration	8m 23s
tls-integration	24m 11s
backup-integration	34m 8s
metric-integration	19m 49s
	3h 9m 48s

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