[Feature Request]: Support onWindowExpiration in Spark runner so that GroupIntoBatches can be used
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new feature
P2
runners
spark
- Dominant language
- Java
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Description
### What would you like to happen?
Support for `onWindowExpiration` is required to produce correct results in GroupIntoBatches. Without the Spark runner might silently swallow unfinished batches.
Related to #21378.
### Issue Priority
Priority: 2
### Issue Component
Component: runner-spark
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