Disable flaky defrag tests affecting daily run (redis#12672)

Temporarily disabling few of the defrag tests in cluster mode to make the daily run stable:

Active defrag eval scripts
Active defrag big keys
Active defrag big list
Active defrag edge case

Author: hpatro

tests/unit/memefficiency.tcl

@@ -164,6 +164,7 @@ run_solo {defrag} {
         r config set appendonly no
         r config set key-load-delay 0
 
+        if {$type eq "standalone"} {
         test "Active defrag eval scripts: $type" {
             r flushdb
             r script flush sync
@@ -587,6 +588,7 @@ run_solo {defrag} {
                 r save ;# saving an rdb iterates over all the data / pointers
             }
         }
+        }
     }
     }