[LIVY-1007]: Livy should not spawn one thread per job to track the job on Kubernetes #453
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What changes were proposed in this pull request?
Instead of spawning a monitor thread for every session, create a centralised thread to monitor all Kubernetes apps.
JIRA link:https://issues.apache.org/jira/browse/LIVY-1007
How was this patch tested?
Unit Tests: The patch has been verified through comprehensive unit tests.
Manual Testing: Conducted manual testing using Kubernetes on Docker Desktop.
Environment: Helm charts. For detailed instructions on testing using Helm charts, please refer to the documentation available at livycluster.