Ideally we would remove this warning entirely, as it is now possible to
reauthenticate without losing connectivty. However, it is still possible to
lose SSH connectivity if the user changes the ownership of the machine when
they do a force-reauth, and we have no way of knowing if they are going to
do that before they do it.
For now, let's just reduce the strength of the warning to warn them that
they "may" lose their connection, rather than they "will".
Updates tailscale/corp#32429
Signed-off-by: James Sanderson <jsanderson@tailscale.com>
70400cb75f