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Restore support for "Override local DNS" (#2438)

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Tailscale allows to override the local DNS settings of a node via
"Override local DNS" [1]. Restore this flag with the same config setting
name `dns.override_local_dns` but disable it by default to align it with
Tailscale's default behaviour.

Tested with Tailscale 1.80.2 and systemd-resolved on Debian 12.

With `dns.override_local_dns: false`:

```
Link 12 (tailscale0)
Current Scopes: DNS
     Protocols: -DefaultRoute -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
   DNS Servers: 100.100.100.100
    DNS Domain: tn.example.com ~0.e.1.a.c.5.1.1.a.7.d.f.ip6.arpa [snip]
```

With `dns.override_local_dns: true`:

```
Link 12 (tailscale0)
Current Scopes: DNS
     Protocols: +DefaultRoute -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
   DNS Servers: 100.100.100.100
    DNS Domain: tn.example.com ~.
```

[1] https://tailscale.com/kb/1054/dns#override-local-dns

Fixes: #2256
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CHANGELOG.md
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@ -92,6 +92,8 @@ The new policy can be used by setting the environment variable
- node FQDNs in the netmap will now contain a dot (".") at the end. This aligns
with behaviour of tailscale.com
[#2503](https://github.com/juanfont/headscale/pull/2503)
- Restore support for "Override local DNS"
[#2438](https://github.com/juanfont/headscale/pull/2438)
## 0.25.1 (2025-02-25)