retains peer's contact-info when making pull requests (#16715)

ClusterInfo::new_pull_requests has to lookup contact-infos:
https://github.com/solana-labs/solana/blob/a1ef2bd74/core/src/cluster_info.rs#L1663-L1673

when it was already available when making pull requests:
https://github.com/solana-labs/solana/blob/a1ef2bd74/core/src/crds_gossip_pull.rs#L232

core/src/cluster_info_metrics.rs

@@ -96,6 +96,7 @@ pub(crate) struct GossipStats {
     pub(crate) prune_message_count: Counter,
     pub(crate) prune_message_len: Counter,
     pub(crate) prune_received_cache: Counter,
+    pub(crate) pull_from_entrypoint_count: Counter,
     pub(crate) pull_request_ping_pong_check_failed_count: Counter,
     pub(crate) pull_requests_count: Counter,
     pub(crate) purge: Counter,
@@ -289,6 +290,11 @@ pub(crate) fn submit_gossip_stats(stats: &GossipStats, gossip: &RwLock<CrdsGossi
             stats.new_pull_requests_count.clear(),
             i64
         ),
+        (
+            "pull_from_entrypoint_count",
+            stats.pull_from_entrypoint_count.clear(),
+            i64
+        ),
         (
             "prune_message_count",
             stats.prune_message_count.clear(),