stream: apply multiple stream/iter cleanups

Author: jasnell

lib/internal/fs/promises.js

@@ -698,6 +698,13 @@ if (getOptionValue('--experimental-stream-iter')) {
         closed = true;
         handle[kLocked] = false;
         handle[kUnref]();
+        if (autoClose) {
+          // The close call will return a promise. On the off chance
+          // the rejects we'll end up with an unhandled rejection.
+          // TODO(@jasnell): Add a closeSync method to the underlying
+          // C++ FileHandle handle.
+          handle.close();
+        }
       },
 
       async [SymbolAsyncDispose]() {