cmd/tailscale/cli: use DNS name instead of Location to hide Mullvad exit nodes from status output

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Previously, we used a non-nil Location as an indicator that a peer is a Mullvad exit node.
However, this is not, or no longer, reliable, since regular exit nodes may also have a non-nil Location,
such as when traffic steering is enabled for a tailnet.

In this PR, we update the plaintext `tailscale status` output to omit only Mullvad exit nodes, rather than all
exit nodes with a non-nil Location. The JSON output remains unchanged and continues to include all peers.

Updates tailscale/corp#30614

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

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