fix(nemesis): nemesis running nodetool status on a dead node
fix(nemesis): nemesis running nodetool status on a dead node

`disrupt_remove_node_then_add_node` code was shadowing the node variable
in a for loop, cause the `target_node` to be assigned to `node`
hence failing randomly

```
26ce06ee-8 [13.48.133.167 | 10.0.2.189] (seed: False) duration=594
error=Unable to run "nodetool  status ": failed connecting to "10.0.2.189" during 60s
Traceback (most recent call last):
File "/home/ubuntu/scylla-cluster-tests/sdcm/nemesis.py", line 2317, in wrapper
result = method(*args, **kwargs)
File "/home/ubuntu/scylla-cluster-tests/sdcm/nemesis.py", line 2584, in disrupt
self.call_random_disrupt_method()
File "/home/ubuntu/scylla-cluster-tests/sdcm/nemesis.py", line 759, in call_random_disrupt_method
disrupt_method()
File "/home/ubuntu/scylla-cluster-tests/sdcm/nemesis.py", line 1822, in disrupt_remove_node_then_ad
removed_node_status = self.cluster.get_node_status_dictionary(
File "/home/ubuntu/scylla-cluster-tests/sdcm/cluster.py", line 3444, in get_node_status_dictionary
status = self.get_nodetool_status(verification_node=verification_node)
File "/home/ubuntu/scylla-cluster-tests/sdcm/utils/decorators.py", line 61, in inner
return func(*args, **kwargs)
File "/home/ubuntu/scylla-cluster-tests/sdcm/cluster.py", line 3321, in get_nodetool_status
res = verification_node.run_nodetool('status')
File "/home/ubuntu/scylla-cluster-tests/sdcm/cluster.py", line 2388, in run_nodetool
result = self.remoter.run(cmd, timeout=timeout, ignore_status=ignore_status, verbose=verbose)
File "/home/ubuntu/scylla-cluster-tests/sdcm/remote/remote_base.py", line 601, in run
result = _run()
File "/home/ubuntu/scylla-cluster-tests/sdcm/utils/decorators.py", line 61, in inner
return func(*args, **kwargs)
File "/home/ubuntu/scylla-cluster-tests/sdcm/remote/remote_base.py", line 591, in _run
self._run_pre_run(cmd, timeout, ignore_status, verbose, new_session, log_file, retry, watchers)
File "/home/ubuntu/scylla-cluster-tests/sdcm/remote/remote_cmd_runner.py", line 106, in _run_pre_ru
raise SSHConnectTimeoutError(
sdcm.remote.base.SSHConnectTimeoutError:
Unable to run "nodetool  status ": failed connecting to "10.0.2.189" during 60s
```

scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests