Dont duplicate `CHECK` constraints and `DEFAULT`s when altering column type #1873

Job	Run time
type generation	13s
license check	5s
dead code check	19s
lint	14s
test (pg: 14.8, schema: public)	48s
examples (pg: 14.8, schema: public)	47s
test (pg: 14.8, schema: non_public)	45s
validate examples JSON	6s
examples (pg: 14.8, schema: non_public)	51s
test (pg: 15.3, schema: public)	52s
examples (pg: 15.3, schema: public)	47s
test (pg: 15.3, schema: non_public)	53s
examples (pg: 15.3, schema: non_public)	46s
examples (pg: 16.0, schema: public)	49s
test (pg: 16.0, schema: public)	54s
examples (pg: 16.0, schema: non_public)	45s
test (pg: 16.0, schema: non_public)	51s
test (pg: latest, schema: public)	51s
test (pg: latest, schema: non_public)	47s
examples (pg: latest, schema: public)	49s
examples (pg: latest, schema: non_public)	44s
release	0s
	13m 56s

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