Make WorkProcessor#blocking always execute futureSupplier #15711
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A common patter across operators is calling WorkProcessor#blocking to report memory usage:
.blocking(() -> memoryContext.setBytes(localAggregatedMemoryContext.getBytes()));
However, before this change lambda wasn't called when upstream processor yielded or was blocked.
This change makes lambda to be always called which makes reporting of operator memory usage more accurate.
Fixes #15679
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