issue: #30553
when datacoord with version 2.2 and querycoord with version 2.3 coexist
during rolling upgrade, `DescribeIndex/GetIndexInfo` will return
`unimplemented` error
This PR add retry on `DescribeIndex/GetIndexInfo`, to prevent load
collection failed during rolling upgrade from milvus 2.2 to 2.3.
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Signed-off-by: Wei Liu <wei.liu@zilliz.com>