Percy Wegmann 1635ccca27 ssh/tailssh: display more useful error messages when authentication fails
Also add a trailing newline to error banners so that SSH client messages don't print on the same line.

Updates tailscale/corp#29138

Signed-off-by: Percy Wegmann <percy@tailscale.com>
2025-06-03 14:00:04 -05:00
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