[9.1] Fix data race with AbstractPageMappingToIteratorOperator (#130963) #130971
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) We need to release the blocks of the page in AbstractPageMappingToIteratorOperator immediately in single-iteration cases, instead of delaying to the next iteration. This is because the blocks of the page are now shared with the output page. The output page can be passed to a separate driver, which may run concurrently with this driver, leading to data races in AbstractNonThreadSafeRefCounted, which is not thread-safe. An alternative would be to make RefCounted for Vectors/Blocks thread-safe when they are about to be shared with other drivers via Relates elastic#130573 Closes elastic#130959 Closes elastic#130958 Closes elastic#130950 Closes elastic#130925 Closes elastic#130881 Closes elastic#130796
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