Make copy-constructible classes copyable #20525

Job	Run time
build_make (ubuntu:24.04)	4m 31s
build_make (ubuntu:25.10)	5m 3s
build_cmake (ubuntu:25.10, true, true)	4m 21s
build_cmake (alpine:3.23, false, false)	4m 37s
build_make (alpine:3.23)	5m 14s
build_cmake (ubuntu:24.04, true, true)	5m 39s
	29m 25s

Provide feedback