[DPE-2446] How-to Upgrade Documentation #715

Job	Run time
Unit tests	1m 18s
Lint	47s
Build charms / Get workflow version / Get workflow version	3s
Build charms / Collect charms	17s
Build charms / Build kafka charm \| 22.04	2m 24s
Build charms / Build application charm \| 22.04	1m 58s
integration-charm	20m 58s
integration-provider	38m 4s
integration-scaling	14m 21s
integration-password-rotation	13m 27s
integration-tls	32m 19s
integration-upgrade	23m 47s
	2h 29m 43s

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