chore(autonat-v2): Fix Spurious Exceptions

[ruediste]

Description

When running autonat-v2, exceptions such as the following are printed on the console:

2026-03-07T15:49:04.263Z libp2p:auto-nat-v2:client:error could not verify addresses - InvalidParametersError: Multiaddr / was not an IPv4, IPv6, DNS, DNS4, DNS6 or DNSADDR address
    at getNetConfig (file:///home/ruedi/git/js-libp2p/packages/utils/dist/src/multiaddr/get-net-config.js:47:19)
    at file:///home/ruedi/git/js-libp2p/packages/protocol-autonat-v2/dist/src/client.js:291:20
    at Array.some (<anonymous>)
    at AutoNATv2Client.verifyExternalAddresses (file:///home/ruedi/git/js-libp2p/packages/protocol-autonat-v2/dist/src/client.js:290:45);

They come from getNetConfig(), which throws an exception when an address isn't a ip4 or ip6 addr. Those exceptions are quite confusing to a newcomer and should not be logged, as it can be expected that other types of addresses are processed.

Notes & open questions

The choice to throw exceptions instead of returning a value for getNetConfig() seems quite debatable to me...

Change checklist

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation if necessary (this includes comments as well)
• I have added tests that prove my fix is effective or that my feature works