Tests

[DPE-2777] Basic sharding int test #921

Job	Run time
Unit tests	2m 42s
Check libraries	35s
Lint	18s
Build charms / Get workflow version / Get workflow version	6s
Build charms / Collect charms	17s
Build charms / Build mongodb charm \| 22.04	2m 40s
Build charms / Build application charm \| 20.04	1m 48s
charm-integration	14m 0s
ha-integration	24m 39s
relation-integration	22m 7s
legacy-integration	3m 28s
tls-integration	20m 26s
backup-integration	24m 45s
metric-integration	20m 44s
sharding-integration	17m 17s
	2h 35m 52s

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