Making Vector default implementation for generated code #2422

Job	Run time
conformance	1m 38s
build (2_12, e2e)	3m 15s
build (2_12, test)	12m 40s
build (2_13, e2e)	4m 7s
build (2_13, test)	9m 16s
build (3, e2e)	4m 20s
build (3, test)	10m 29s
build (2_12, examples_and_formatting)	2m 36s
build (2_13, scala3_compat_test)	6m 6s
build (3, scala3_compat_test)	8m 51s
ci-passed	1s
	1h 3m 19s

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