Make copy-constructible classes copyable #20532

Job	Run time
build_cmake (alpine:3.23, false, false)	4m 21s
build_cmake (ubuntu:25.10, true, true)	5m 34s
build_make (ubuntu:24.04)	4m 32s
build_make (ubuntu:25.10)	4m 31s
build_cmake (ubuntu:24.04, true, true)	5m 3s
build_make (alpine:3.23)	6m 5s
	30m 6s

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