Implement schema for user secrets management #702

Job	Run time
Build	1m 29s
Integration (1.6.*, 5.19/stable, lxd, 5.19, 2.9)	30m 6s
Integration (1.6.*, 5.19/stable, lxd, 5.19, 3)	28m 54s
Integration (1.6.*, 5.19/stable, microk8s, 1.28, 2.9)	9m 20s
Integration (1.6.*, 5.19/stable, microk8s, 1.28-strict, 3)	10m 5s
Integration (1.7.*, 5.19/stable, lxd, 5.19, 2.9)	30m 31s
Integration (1.7.*, 5.19/stable, lxd, 5.19, 3)	30m 15s
Integration (1.7.*, 5.19/stable, microk8s, 1.28, 2.9)	9m 31s
Integration (1.7.*, 5.19/stable, microk8s, 1.28-strict, 3)	9m 22s
Integration (1.8.*, 5.19/stable, lxd, 5.19, 2.9)	31m 10s
Integration (1.8.*, 5.19/stable, lxd, 5.19, 3)	29m 23s
Integration (1.8.*, 5.19/stable, microk8s, 1.28, 2.9)	9m 29s
Integration (1.8.*, 5.19/stable, microk8s, 1.28-strict, 3)	8m 49s
	3h 58m 24s

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