ObjCExport: remove KotlinUnit from suspend funs returning Unit (#4635)
With `unitSuspendFunctionObjCExport=proper` binary option, for Unit-returning suspend functions ObjCExport now generates completion handlers without redundant `KotlinUnit*` result parameter. So Swift (5.5+) can import these functions as Void-returning async functions. ^KT-47399 Fixed
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