Add support for exporting to Mill 1.1.x series (tests on Mill 1.1.0-RC4)#4055

Gedochao wants to merge 2 commits intoVirtusLab:mainVirtusLab/scala-cli:mainfrom

Gedochao:feature/export-mill-1.1.0-RC4Gedochao/scala-cli:feature/export-mill-1.1.0-RC4Copy head branch name to clipboard