Drain Mode as WindowedValue extension #36949

Job	Run time
Java Unit Tests (self-hosted, ubuntu-20.04, main)	17m 33s
Java Unit Tests (macos-latest)	8m 57s
Java Wordcount Direct Runner (self-hosted, ubuntu-20.04, main)	23m 53s
Java Unit Tests (windows-latest)	14m 20s
Java Wordcount Direct Runner (macos-latest)	9m 50s
Java Wordcount Direct Runner (windows-latest)	18m 50s
	1h 33m 23s

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