[8.17] Fix RestCancellableNodeClientTests (#128085)
#128088
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These tests set `closeListener` racily, such that it's possible to see it still be `null` in `TestHttpChannel#close()`. This commit replaces it with a `SubscribableListener` so that we always complete the subscribed listener regardless of order. It also fixes a separate race in `testCompletedTasks` where (very rarely) all of the `client.execute` calls had completed their listener without getting to the point where they'd subscribed a `closeListener`. Closes elastic#128057
DaveCTurner
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:Distributed Coordination/Task Management
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Backports the following commits to 8.17:
RestCancellableNodeClientTests(FixRestCancellableNodeClientTests#128085)