Tests

[DPE-3310] New DataPeer(Unit) objects handling Peer Relation Data (so far secrets only) #1189

Job	Run time
Unit tests	2m 25s
Lint	11s
Check libraries	25s
Build charms / Get workflow version / Get workflow version	3s
Build charms / Collect charms	15s
Build charms / Build mongodb charm \| base #0	1m 40s
Build charms / Build legacy-application charm \| base #0	1m 38s
Build charms / Build application charm \| base #0	1m 16s
charm-integration	7m 46s
ha-integration	8m 3s
relation-integration	8m 45s
legacy-integration	3m 24s
tls-integration	7m 57s
backup-integration	8m 4s
metric-integration	6m 49s
sharding-integration	8m 55s
sharding-relation-integration	8m 50s
	1h 16m 26s

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