[Bug]: Default value in a global side input doesn't work with DirectRunner

### What happened?

When using a side input like the one documented [here](https://beam.apache.org/documentation/patterns/side-inputs/#slowly-updating-global-window-side-inputs), using `org.apache.beam.sdk.transforms.View.AsSingleton#withDefaultValue` to configure a default value doesn't seem to work.

- Is a default value supported when using the global window?

Example:

```java

public class SideInputDefaultTest {

@Test
public void test() {
final DirectOptions options = PipelineOptionsFactory.as(DirectOptions.class);
options.setBlockOnRun(true);
final Pipeline pipeline = Pipeline.create(options);

final Duration sideInputWindowSize = Duration.standardSeconds(10);
final PCollectionView sideInput =
pipeline.apply(GenerateSequence.from(1).withRate(1, sideInputWindowSize))
.apply(Window.into(FixedWindows.of(sideInputWindowSize)))
.apply(Combine.globally(Max.ofLongs()).withoutDefaults())
.apply(ParDo.of(new AlwaysNull()))
.apply(Window.into(new GlobalWindows())
.triggering(Repeatedly.forever(AfterPane.elementCountAtLeast(1)))
.discardingFiredPanes())
.apply(View.asSingleton().withDefaultValue("0"));

final Instant start = Instant.now();
final Duration windowSize = Duration.standardSeconds(5);
pipeline.apply(TestStream.create(StringUtf8Coder.of())
.addElements(TimestampedValue.of("a", start))
.addElements(TimestampedValue.of("b", start.plus(windowSize)))
.advanceWatermarkToInfinity())
.apply(Window.into(FixedWindows.of(windowSize)))
.apply(ParDo.of(new ConcatFn(sideInput)).withSideInputs(sideInput));

pipeline.run();
}

private static class ConcatFn extends DoFn {

private final PCollectionView sideInput;

public ConcatFn(final PCollectionView sideInput) {
this.sideInput = sideInput;
}

@ProcessElement
public void process(final ProcessContext context, final OutputReceiver receiver) {
receiver.output(context.element() + " " + context.sideInput(sideInput));
}
}

private static class AlwaysNull extends DoFn {

@ProcessElement
public void process() {
// do nothing to force the default
}
}
}
```

### Issue Priority

Priority: 2 (default / most bugs should be filed as P2)

### Issue Components

- [ ] Component: Python SDK
- [X] Component: Java SDK
- [ ] Component: Go SDK
- [ ] Component: Typescript SDK
- [ ] Component: IO connector
- [ ] Component: Beam examples
- [ ] Component: Beam playground
- [ ] Component: Beam katas
- [ ] Component: Website
- [ ] Component: Spark Runner
- [ ] Component: Flink Runner
- [ ] Component: Samza Runner
- [ ] Component: Twister2 Runner
- [ ] Component: Hazelcast Jet Runner
- [ ] Component: Google Cloud Dataflow Runner

Start with the DirectRunner handling of View.AsSingleton withDefaultValue in the Java SDK, using the SideInputDefaultTest example as the reproduction. Verify the behavior with the global-window side input when no value is produced; done means the configured default value is returned and the regression test passes.

Written by the indexing model from the issue text.