Tests

[DPE-2645] POC Add shards to cluster #799

Job	Run time
Unit tests	2m 32s
Lint	13s
Check libraries	24s
Build charms / Get workflow version / Get workflow version	5s
Build charms / Collect charms	15s
Build charms / Build mongodb charm \| 22.04	2m 29s
Build charms / Build application charm \| 20.04	1m 50s
charm-integration	11m 55s
ha-integration	49m 53s
relation-integration	20m 46s
legacy-integration	4m 23s
tls-integration	25m 16s
backup-integration	1h 6m 47s
metric-integration	19m 58s
	3h 26m 46s

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