Move backfill options to `start` and `migrate` command #3247

Job	Run time
cross-platform build	5m 49s
check ledger	5s
dead code check	19s
examples (pg: 14.8, schema: public)	31s
examples (pg: 14.8, schema: non_public)	32s
validate examples JSON	7s
examples (pg: 15.3, schema: public)	32s
license check	6s
lint	1m 16s
examples (pg: 15.3, schema: non_public)	32s
examples (pg: 16.4, schema: public)	30s
type generation	19s
test (pg: 14.8, schema: public)	55s
examples (pg: 16.4, schema: non_public)	31s
test (pg: 14.8, schema: non_public)	55s
examples (pg: 17.0, schema: public)	36s
test (pg: 15.3, schema: public)	56s
examples (pg: 17.0, schema: non_public)	37s
test (pg: 15.3, schema: non_public)	56s
examples (pg: latest, schema: public)	31s
test (pg: 16.4, schema: public)	1m 0s
examples (pg: latest, schema: non_public)	32s
test (pg: 16.4, schema: non_public)	54s
test (pg: 17.0, schema: public)	58s
test (pg: 17.0, schema: non_public)	1m 2s
test (pg: latest, schema: public)	57s
test (pg: latest, schema: non_public)	1m 2s
release	0s
	23m 0s

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