Remove unit test pendingquerybuf.tcl since pending_querybuf no longer exists. (#11429)

tests/test_helper.tcl

@@ -86,7 +86,6 @@ set ::all_tests {
     unit/wait
     unit/pause
     unit/querybuf
-    unit/pendingquerybuf
     unit/tls
     unit/tracking
     unit/oom-score-adj

tests/unit/pendingquerybuf.tcl

@@ -1,28 +0,0 @@
-proc info_memory {r property} {
-    if {[regexp "\r\n$property:(.*?)\r\n" [{*}$r info memory] _ value]} {
-        set _ $value
-    }
-}
-
-start_server {tags {"wait external:skip"}} {
-start_server {} {
-    set slave [srv 0 client]
-    set slave_host [srv 0 host]
-    set slave_port [srv 0 port]
-    set master [srv -1 client]
-    set master_host [srv -1 host]
-    set master_port [srv -1 port]
-
-    test "pending querybuf: check size of pending_querybuf after set a big value" {
-        $slave slaveof $master_host $master_port
-        set _v [prepare_value [expr 32*1024*1024]]
-        $master set key $_v 
-        wait_for_ofs_sync $master $slave
-
-        wait_for_condition 50 100 {
-            [info_memory $slave used_memory] <= [info_memory $master used_memory] + 10*1024*1024
-        } else {
-            fail "the used_memory of replica is much larger than master."
-        }
-    }  
-}}