[8.19] Fix testStopQueryLocal (#131130) #131145
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By default, ES|QL uses all workers in the esql_worker threadpool to execute drivers on data nodes. If a node is both data and coordinator, and all drivers are blocked by the allowEmitting latch, there are no workers left to execute the final driver or fetch pages from remote clusters. This can prevent remote clusters from being marked as successful on the coordinator, even if they have completed. To avoid this, we reserve at least one worker for the final driver and page fetching. A single worker is enough, as these two tasks can be paused and yielded. Closes elastic#121672
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