Add missing consul connection flags to vtcombo.txt

Adds topo_consul_idle_conn_timeout, topo_consul_max_conns_per_host, and topo_consul_max_idle_conns flags to vtcombo.txt to match vtgate.txt.

Co-Authored-By: Claude <svc-devxp-claude@slack-corp.com>
Signed-off-by: Tanjin Xu <tanjin.xu@slack-corp.com>

Author: tanjinx

go/flags/endtoend/vtcombo.txt

@@ -366,9 +366,12 @@ Flags:
       --tablet_types_to_wait strings                                     Wait till connected for specified tablet types during Gateway initialization. Should be provided as a comma-separated set of tablet types.
       --tablet_url_template string                                       Format string describing debug tablet url formatting. See getTabletDebugURL() for how to customize this. (default "http://{{ "{{.GetTabletHostPort}}" }}")
       --throttle_tablet_types string                                     Comma separated VTTablet types to be considered by the throttler. default: 'replica'. example: 'replica,rdonly'. 'replica' always implicitly included (default "replica")
+      --topo_consul_idle_conn_timeout duration                           Maximum amount of time to pool idle connections. (default 1m30s)
       --topo_consul_lock_delay duration                                  LockDelay for consul session. (default 15s)
       --topo_consul_lock_session_checks string                           List of checks for consul session. (default "serfHealth")
       --topo_consul_lock_session_ttl string                              TTL for consul session.
+      --topo_consul_max_conns_per_host int                               Maximum number of consul connections per host.
+      --topo_consul_max_idle_conns int                                   Maximum number of idle consul connections. (default 100)
       --topo_consul_watch_poll_duration duration                         time of the long poll for watch queries. (default 30s)
       --topo_etcd_lease_ttl int                                          Lease TTL for locks and leader election. The client will use KeepAlive to keep the lease going. (default 30)
       --topo_etcd_tls_ca string                                          path to the ca to use to validate the server cert when connecting to the etcd topo server