[8.6] Refactor enrich maintenance coordination logic (#90931) #92210
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This PR refactors the locking logic for enrich policies so that enrich index names are resolved early so that they may be explicitly protected from maintenance tasks on the master node. The maintenance service has been optimized to allow for concurrent removal of old enrich indices while policies are executing. Further concurrency changes were made to improve the thread safety of the system (such as removing the double check locking in maintenance and the ability to unlock policies from code that does not hold the lock). (cherry picked from commit 998520e)
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