Rename searchV2 to HybridSearch

[xige-16]

/kind improvement
issue : milvus-io/milvus#25639

Signed-off-by: xige-16 xi.ge@zilliz.com

[sre-ci-robot]

@xige-16: The label(s) kind/improvement cannot be applied, because the repository doesn't have them.

In response to this:

/kind improvement
issue : milvus-io/milvus#25639

Signed-off-by: xige-16 xi.ge@zilliz.com

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[XuanYang-cn]

/lgtm
/approve

[sre-ci-robot]

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