[Task]: Propagate context from windmill to windowedValue

[stankiewicz]

What needs to happen?

Propagate context from windmill to windowedValue https://github.com/apache/beam/blob/81bb5066bab883f79328e52f0d2a55e9b90f2f65/runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/UngroupedWindmillReader.java#L145

Issue Priority

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

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[stankiewicz]

.take_issue