Tests

[DPE-2609] Remove support of Juju 2.9 #780

Job	Run time
Unit tests	2m 31s
Lint	20s
Check libraries	26s
Build charms / Get workflow version / Get workflow version	4s
Build charms / Collect charms	18s
Build charms / Build mongodb charm \| 22.04	2m 31s
Build charms / Build application charm \| 20.04	1m 48s
charm-integration	16m 15s
ha-integration	1h 3m 25s
relation-integration	20m 56s
legacy-integration	3m 49s
tls-integration	25m 20s
backup-integration	1h 11m 46s
metric-integration	19m 7s
	3h 48m 36s

Provide feedback