tstest/integration: clear SSH_CLIENT env to prevent false positive detection

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When running integration tests over SSH (e.g., in remote development
environments), the SSH_CLIENT environment variable is set. This causes
isSSHOverTailscale() to incorrectly detect an SSH session and change
behavior.

Clear SSH_CLIENT in the test node environment to prevent these false
positives.

Fixes #19393

Change-Id: I1411abf0be9704cce37051476efb04d59beed386
Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>

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