mtr: increase more timeouts under debuggers

in particular, debug_sync timeout and wait_for_pos timeout

mysql-test/lib/My/Debugger.pm

@@ -256,6 +256,7 @@ sub pre_setup() {
     $::opt_suite_timeout= 7 * 24 * 60;    # in minutes
     $::opt_shutdown_timeout= 24 * 60 *60; # in seconds
     $::opt_start_timeout= 24 * 60 * 60;   # in seconds
+    $::opt_debug_sync_timeout= 3000;      # in seconds
   }
 }
 

mysql-test/mysql-test-run.pl

@@ -5662,6 +5662,8 @@ sub start_mysqltest ($) {
     mtr_add_arg($args, "--result-file=%s", $tinfo->{'result_file'});
   }
 
+  mtr_add_arg($args, "--wait-for-pos-timeout=%d", $opt_debug_sync_timeout);
+
   client_debug_arg($args, "mysqltest");
 
   if ( $opt_record )