Making Vector default implementation for generated code #2317

Job	Run time
conformance	1m 53s
build (2_12, e2e)	3m 30s
build (2_12, test)	13m 17s
build (2_13, e2e)	4m 20s
build (2_13, test)	11m 7s
build (3, e2e)	4m 37s
build (3, test)	9m 55s
build (2_12, examples_and_formatting)	2m 59s
build (2_13, scala3_compat_test)	9m 59s
build (3, scala3_compat_test)	9m 50s
ci-passed	1s
	1h 11m 28s

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