Fix etcdctl output redirect typo.

[iagusev]

Description

Fix incorrect stderr redirection in etcdctl wrapper script when pulling etcd image via containerd.
The previous redirection syntax suppressed logs incorrectly due to a typo.

Solution

Fixed shell redirection typo in etcdctl wrapper script:

• Replaced invalid 2&>1 redirection with correct 2>&1
• Ensured stderr is properly redirected together with stdout to /dev/null
• No functional behavior change besides correct log suppression

Test Cases

Steps:

1. Run etcdctl member list on control-plane node
2. Ensure etcd image is pulled via wrapper script and command completed
3. Verify no stderr output is leaked to terminal or to file 1 in current directory

Checklist

• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• There is no breaking changes, or migration patch is provided
• Integration CI passed
• No changes in unit tests required
• There is no merge conflicts