fix: unknown network error for regtest

[chadchapnick]

Checks for REGTEST network in Coldcard and Custom interactions rather than throwing "Unknown network"

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Name	Status	Preview	Comments	Updated (UTC)
caravan-coordinator	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 18, 2024 9:58pm

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🦋 Changeset detected

Latest commit: f0021fd2e6a17d18a7e9dfa65e2c47e266692eca

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ---------------- | ----- | | @caravan/wallets | Patch |

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[chadchapnick]

I'm seeing at least one other location this same subset is hardcoded in @carvan/bitcoin. The reusable array would be much easier to maintain!