Fix entry cache size update logic so it won't go negative. #10225
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Fixes #10016
Motivation
Metrics
pulsar_ml_cache_used_sizecan to negative sometime.Modifications
Only place where we could subtract more from the cache size then we add to it is when an EntryCache is cleared, the returned value is not the size of entries removed but the size of cache before clear(). Update the behavior here to return the size of entries removed.
Verifying this change
Added unit test.