ipn/ipnlocal,net/dns/resolver: use the user dialer and routes for DNS forwarding by default, except on iOS and Android

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In this PR, we make the "user-dial-routes" behavior default on all platforms except for iOS and Android.
It can be disabled by setting the TS_DNS_FORWARD_USE_ROUTES envknob to 0 or false.

Updates #12027
Updates #13837

Signed-off-by: Nick Khyl <nickk@tailscale.com>

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