[io] Take pending writes into account in _SocketStreamConsumer On Windows `_NativeSocket.nativeWrite` returning to caller does not mean that the data was flushed into OS buffer. Overlapped operation might still be in progress - and it will be cancelled with data loss if we close the handle. This means _SocketStreamConsumer should take such pending writes into account and not issue `done` event until pending write completes. This change prevents data loss when communicating with subprocesses on Windows. Previously even doing `await process.stdin.flush()` would not guarantee data delivery. Fixes https://github.com/dart-lang/sdk/issues/50904 TEST=tests/standalone/io/regress_50904_test.dart Cq-Include-Trybots: luci.dart.try:vm-win-release-x64-try,vm-win-debug-x64-try,pkg-win-release-try Change-Id: I13ab2cc3ce45f1ff8cb3183884d26bbb2b72f7ac Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/307043 Reviewed-by: Brian Quinlan <bquinlan@google.com> Commit-Queue: Slava Egorov <vegorov@google.com>
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