Tests

Tests #722

Job	Run time
Lint	14s
Unit tests	2m 24s
Check libraries	28s
Build charms / Get workflow version / Get workflow version	5s
Build charms / Collect charms	12s
Build charms / Build mongodb charm \| 22.04	4m 1s
Build charms / Build application charm \| 20.04	2m 41s
charm-integration	9m 31s
ha-integration	1h 30m 52s
relation-integration	19m 45s
legacy-integration	33m 38s
tls-integration	9m 47s
backup-integration	1h 11m 38s
metric-integration	19m 22s
	4h 24m 38s

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