Fix dual-channel replication test under valgrind (valkey-io#904)

Test dual-channel-replication primary gets cob overrun during replica
rdb load` fails during the Valgrind run. This is due to the load
handlers disconnecting before the tests complete, resulting in a low
primary COB. Increasing the handlers' timeout should resolve this issue.

Failure:
https://github.com/valkey-io/valkey/actions/runs/10361286333/job/28681321393

Server logs reveals that the load handler clients were disconnected
before the test started

Also the two previus test took about 20 seconds which is the handler
timeout.

---------

Signed-off-by: naglera <anagler123@gmail.com>
Signed-off-by: Madelyn Olson <madelyneolson@gmail.com>
Co-authored-by: Madelyn Olson <madelyneolson@gmail.com>
Signed-off-by: mwish <maplewish117@gmail.com>

tests/integration/dual-channel-replication.tcl

@@ -697,9 +697,9 @@ start_server {tags {"dual-channel-replication external:skip"}} {
         set replica_log [srv 0 stdout]
         set replica_pid  [srv 0 pid]
 
-        set load_handle0 [start_write_load $primary_host $primary_port 20]
-        set load_handle1 [start_write_load $primary_host $primary_port 20]
-        set load_handle2 [start_write_load $primary_host $primary_port 20]
+        set load_handle0 [start_write_load $primary_host $primary_port 60]
+        set load_handle1 [start_write_load $primary_host $primary_port 60]
+        set load_handle2 [start_write_load $primary_host $primary_port 60]
 
         $replica config set dual-channel-replication-enabled yes
         $replica config set loglevel debug
@@ -709,22 +709,22 @@ start_server {tags {"dual-channel-replication external:skip"}} {
             # Pause primary main process after fork
             $primary debug pause-after-fork 1
             $replica replicaof $primary_host $primary_port
-            wait_for_log_messages 0 {"*Done loading RDB*"} 0 2000 1
+            wait_for_log_messages 0 {"*Done loading RDB*"} 0 1000 10
 
             # At this point rdb is loaded but psync hasn't been established yet. 
             # Pause the replica so the primary main process will wake up while the
             # replica is unresponsive. We expect the main process to fill the COB and disconnect the replica.
             pause_process $replica_pid
             wait_and_resume_process -1
             $primary debug pause-after-fork 0
-            wait_for_log_messages -1 {"*Client * closed * for overcoming of output buffer limits.*"} $loglines 2000 1
+            wait_for_log_messages -1 {"*Client * closed * for overcoming of output buffer limits.*"} $loglines 1000 10
             wait_for_condition 50 100 {
                 [string match {*replicas_waiting_psync:0*} [$primary info replication]]
             } else {
                 fail "Primary did not free repl buf block after sync failure"
             }
             resume_process $replica_pid
-            set res [wait_for_log_messages -1 {"*Unable to partial resync with replica * for lack of backlog*"} $loglines 20000 1]
+            set res [wait_for_log_messages -1 {"*Unable to partial resync with replica * for lack of backlog*"} $loglines 2000 10]
             set loglines [lindex $res 1]
         }
         $replica replicaof no one