cmd/atlas/internal/cmdapi: remove --plan and --to constraint (#3167) #1832

Job	Run time
generate-cmp	37s
lint	33s
cli	3m 12s
unit (1.22)	17s
integration	39s
dialect-integration / integration-maria107	2m 46s
dialect-integration / integration-maria102	2m 47s
dialect-integration / integration-mysql56	2m 49s
dialect-integration / integration-mysql57	2m 47s
dialect-integration / integration-mysql8	2m 54s
dialect-integration / integration-postgres10	3m 2s
dialect-integration / integration-maria103	2m 55s
dialect-integration / integration-postgres11	3m 12s
dialect-integration / integration-postgres12	3m 3s
dialect-integration / integration-postgres13	3m 2s
dialect-integration / integration-postgres-ext-postgis	3m 7s
dialect-integration / integration-postgres15	3m 18s
dialect-integration / integration-sqlite	2m 25s
dialect-integration / integration-postgres14	3m 6s
dialect-integration / integration-tidb5	3m 19s
dialect-integration / integration-tidb6	3m 36s
dialect-integration / integration-cockroach	2m 48s
	56m 14s

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