CLI: Remove `--auto` flag #1422

Job	Run time
System (1.22.x, add)	18m 18s
System (1.22.x, instances)	33m 13s
Code	57s
System (1.22.x, basic)	1h 24m 44s
System (1.22.x, recover)	21m 7s
System (1.22.x, interactive)	1h 45m 37s
System (1.22.x, mismatch)	27m 15s
System (1.22.x, preseed)	28m 32s
documentation-checks / Run documentation checks	1m 11s
Trigger snap edge build	0s
	5h 20m 54s

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