K8shim may have staled nodes causing problems

When adding/removing nodes back and force, and nodes are created with same name. In such cases, the shared index informer may trigger Update event instead of an Add (resource key is the same). If the node has stale info in the cache, this will cause the fix we did for YUNIKORN-220 not work. We need to make sure when a node is deleted, the corresponding info is also deleted from the cache.