related issue: #40698
1. use vector datat types instead of hard code datatpe names
2. update search pagination tests
3. remove checking distances in search results checking, for knowhere
customize the distances for different metrics and indexes. Now only
assert the distances are sorted correct.
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Signed-off-by: yanliang567 <yanliang.qiao@zilliz.com>
issue: https://github.com/milvus-io/milvus/issues/38877
1. refactor pymilvus client v2 testcasebase
2. add a test for search hint
3. update pymilvus to 2.6
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Signed-off-by: yanliang567 <yanliang.qiao@zilliz.com>
