Cleanup: remove or hide some `InternalCoroutinesApi`#4548

dkhalanskyjb merged 1 commit intodevelopKotlin/kotlinx.coroutines:developfrom

dkhalanskyjb/remove-runSingleTaskFromCurrentSystemDispatcherKotlin/kotlinx.coroutines:dkhalanskyjb/remove-runSingleTaskFromCurrentSystemDispatcherCopy head branch name to clipboard