[Bug]: GBK with global window must fit all values for a key into a memory

### What happened?

With optimization global window grouping in Spark
https://issues.apache.org/jira/browse/BEAM-12646

https://github.com/apache/beam/commit/8c3af01cdf404891e82f2f4c9b6d8e369ebdad4f#diff-c13404655c9bf261fcbcc72feb949e0ffcf428802897d2f39097f34d7a3d995aL185

it reintroduced issue for jobs with global windows. Now it is using spark's groupByKey = all values for a single key need to fit in-memory at once. It was already solved in:
https://issues.apache.org/jira/browse/BEAM-5392

### Issue Priority

Priority: 3 (minor)

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