[8.x] Fix memory leak in task manager task runner (#193612) #193626
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In this PR, I'm fixing a memory leak that was introduced in elastic#190093 where every task runner class object wouldn't free up in memory because it subscribed to the `pollIntervalConfiguration$` observable. To fix this, I moved the observable up a class into `TaskPollingLifecycle` which only gets created once on plugin start and then pass down the pollInterval value via a function call the task runner class can call. (cherry picked from commit cf6e8b5)
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