Minimally constify `Add` #141595

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Job	Run time
Calculate job matrix	11s
PR - mingw-check	35m 5s
PR - mingw-check-tidy	9m 37s
PR - x86_64-gnu-llvm-18	1h 6m 48s
PR - x86_64-gnu-tools	48m 52s
bors build finished	0s
	2h 40m 33s