Add test for ziplist (nextdiff == -4 && reqlen < 4) (#9218)
The if judgement `nextdiff == -4 && reqlen < 4` in __ziplistInsert. It's strange, but it's useful. Without it there will be problems during chain update. Till now these lines didn't have coverage in the tests, and there was a question if they are at all needed (#7170)
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