Remove deprecated do-while #2266

Job	Run time
conformance	1m 37s
build (2_12, mima)	1m 13s
build (2_12, e2e)	3m 19s
build (2_12, test)	3m 36s
build (2_13, mima)	1m 12s
build (2_13, e2e)	3m 40s
build (2_13, test)	4m 3s
build (3, mima)	5s
build (3, e2e)	3m 17s
build (3, test)	2m 27s
build (2_12, examples_and_formatting)	2m 45s
build (2_13, scala3_compat_test)	3m 59s
build (3, scala3_compat_test)	2m 38s
ci-passed	0s
	33m 51s

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