Make copy-constructible classes copyable #20355

Job	Run time
build_make (ubuntu:24.04)	4m 44s
build_make (ubuntu:25.10)	6m 7s
build_cmake (ubuntu:25.10, true, true)	5m 4s
build_cmake (alpine:3.23, false, false)	4m 43s
build_make (alpine:3.23)	3m 44s
build_cmake (ubuntu:24.04, true, true)	4m 42s
	29m 4s

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