Backport "Revert recent changes to opaque type proxy generation" to 3.7.1#23228

WojciechMazur merged 3 commits intorelease-3.7.1scala/scala3:release-3.7.1from

backport-release-3.7.1-23059scala/scala3:backport-release-3.7.1-23059Copy head branch name to clipboard