fix:release partition before drop it

[wildBigPanda]

when call Collection drop_partition func，has error:

pymilvus.decorators | RPC error: [drop_partition], <MilvusException: (code=1, message=partition cannot be dropped, partition is loaded, please release it first)>, <Time:{'RPC start': '2024-03-28 16:13:04.921025', 'RPC error': '2024-03-28 16:13:04.923609'}>

fix Collection drop_partition func call，release partition before drop it

[sre-ci-robot]

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[sre-ci-robot]

Welcome @wildBigPanda! It looks like this is your first PR to milvus-io/pymilvus 🎉

[XuanYang-cn]

@wildBigPanda This behaviour is by design

[wildBigPanda]

@XuanYang-cn Is the design unreasonable? To drop partition, you have to call the release interface again separately, and the related interface for releasing partitions cannot be found in [collection.py]. How can you release it and drop a partitions?