[Segment Replication] - SeqNo and Version comparison between shards is not accurate.

[mch2]

The seqNo that is currently sent to replicas from the primary shard is its processed checkpoint. This is fetched close to when the latest infos are fetched, but does not guarantee that this seqNo is the max seqNo from the copied SegmentInfos. We need to update this to query for the max seqNo using changes introduced in #5970.

Further, the version number on replica's SegmentInfos is incorrectly increased when it performs a commit. This will incorrectly force the replica to ignore incoming checkpoints from the primary if the SegmentInfos version is only increased by 1.