chore: Replaced testnet with signet

[daviroo]

No description provided.

[openoms]

LGTM

Reports testnet for signet as needed for bitcoinjs.

Indeed there is no difference between signet and testnet onchain addresses.

[ntheile]

@daviroo , @openoms

I am getting a parsing error in the mobile app for signet when trying to pay an invoice Please enter a valid destination I noticed this comment from bitcoinjs/bolt11 bitcoinjs/bolt11#58

According to the comment I think we need to "Use a custom Network during decode if the network is signet ( add the network object with tbs into the second arg for decode)".

I was able to hack it into the client in the file parsing-v2/index.ts here

I replaced this

payReq = bolt11.decode(lnProtocol)

with this https://github.com/bitcoinjs/bolt11/pull/58/files#diff-d717eb8408568e7a9e8b3add508df7571aafbed62ca52a1bd22fe224f18e5e17R37-R43

payReq = bolt11.decode(lnProtocol, {
    bech32: 'tbs',
    pubKeyHash: 0x6f,
    scriptHash: 0xc4,
    validWitnessVersions: [0, 1]
})