Generate code using fully qualified type names #2885

Job	Run time
conformance	4m 23s
build (2_12, e2e)	3m 52s
build (2_12, test)	12m 10s
build (2_12, examples_and_formatting)	3m 24s
build (3, test)	10m 9s
build (2_13, e2e)	4m 41s
build (2_13, test)	12m 40s
build (3, scala3_compat_test)	7m 20s
build (3, e2e)	5m 13s
build (2_13, scala3_compat_test)	7m 23s
ci-passed	3s
	1h 11m 18s

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