[8.13] ProjectOperator should not retain references to released blocks (#105848) #105883
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…tic#105848) The heap attack tests hit OOM where the circuit breaker was under-accounted. This was because the ProjectOperator retained references to released blocks. Consequently, the released block couldn't be GCed although we have decreased memory usage in the circuit breaker. Relates elastic#10563
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Backports the following commits to 8.13: