Tests

[DPE-2778] Shard removal tests #948

Job	Run time
Check libraries	30s
Unit tests	2m 32s
Lint	13s
Build charms / Get workflow version / Get workflow version	8s
Build charms / Collect charms	14s
Build charms / Build mongodb charm \| base #0	2m 44s
Build charms / Build application charm \| base #0	1m 47s
charm-integration	3m 48s
ha-integration	4m 54s
relation-integration	3m 57s
legacy-integration	4m 10s
tls-integration	3m 43s
backup-integration	4m 58s
metric-integration	4m 20s
sharding-integration	4m 13s
	42m 11s

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