[BP 6.6.2 MB-43884] - Cluster info cache refresh optimisations - Query buckets.uri endpoint only on a change in version hash

Whenever there is a change in poolsStreaming endpoint, indexer currently queries bucket.uri endpoint to fetch list of all buckets. This is not necessary and the buckets.uri endpoint can be queried only when there is a change in the version hash provided with the poolsStreaming endpoint.

Sample bucket.uri endpoint: buckets?v=108371236&uuid=242e131dd148b2264e79aad3dbb5794f

The version hash (108371236) will change only when there is a change in bucket UUID/node status/bucket list change. So, for most cases, indexer need to refresh its bucket cache.

Only exception is KV_Sender. During rebalance, kv_sender requires latest vbucket map. The change to vbucket map does not trigger a pool change notification. So, KV sender should fetch the bucket map from the corresponding terstBucketBase endpoint instead of relying on cluster info cache.