feat(storage): extend application schema for storage flag #815

Job	Run time
Build	1m 39s
Integration (1.6.*, 5.19/stable, lxd, 5.19, 2.9)	14m 51s
Integration (1.6.*, 5.19/stable, lxd, 5.19, 3)	12m 26s
Integration (1.6.*, 5.19/stable, microk8s, 1.28, 2.9)	8m 3s
Integration (1.6.*, 5.19/stable, microk8s, 1.28-strict, 3)	11m 40s
Integration (1.7.*, 5.19/stable, lxd, 5.19, 2.9)	28m 36s
Integration (1.7.*, 5.19/stable, lxd, 5.19, 3)	22m 16s
Integration (1.7.*, 5.19/stable, microk8s, 1.28, 2.9)	7m 54s
Integration (1.7.*, 5.19/stable, microk8s, 1.28-strict, 3)	8m 36s
Integration (1.8.*, 5.19/stable, lxd, 5.19, 2.9)	22m 25s
Integration (1.8.*, 5.19/stable, lxd, 5.19, 3)	17m 55s
Integration (1.8.*, 5.19/stable, microk8s, 1.28, 2.9)	7m 58s
Integration (1.8.*, 5.19/stable, microk8s, 1.28-strict, 3)	9m 14s
	2h 53m 33s

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