Tests

Tests #847

Job	Run time
Unit tests	2m 33s
Lint	13s
Check libraries	27s
Build charms / Get workflow version / Get workflow version	7s
Build charms / Collect charms	14s
Build charms / Build mongodb charm \| 22.04	4m 9s
Build charms / Build application charm \| 20.04	2m 46s
charm-integration	14m 13s
ha-integration	2h 0m 15s
relation-integration	28m 16s
legacy-integration	8m 25s
tls-integration	27m 35s
backup-integration	42m 32s
metric-integration	18m 59s
	4h 30m 44s

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