feat: add testnet bootnodes

[doitian]

What problem does this PR solve?

Issue Number: close #3779

What is changed and how it works?

What's Changed:

<   "/ip4/35.176.207.239/tcp/8111/p2p/QmSJTsMsMGBjzv1oBNwQU36VhQRxc2WQpFoRu1ZifYKrjZ"
---
>   "/ip4/35.176.207.239/tcp/8111/p2p/QmSJTsMsMGBjzv1oBNwQU36VhQRxc2WQpFoRu1ZifYKrjZ",
>   # Virginia, North America
>   "/ip4/47.90.209.219/tcp/8111/p2p/QmRJKqD4gdp7mhC4cz8uMSdPEjXzBdN3J8pARJBvNPk3G3",
>   # Sydney, Australia
>   "/ip4/47.74.66.72/tcp/8111/p2p/QmPhgweKm2ciYq52LjtEDmKFqHxGcg2WQ8RLCayRRycanD",
>   # Frankfurt, Europe
>   "/ip4/47.254.175.152/tcp/8111/p2p/QmXw7RsAR9bghvW4LrjrVBEwTMbdnpTEdWEtZSVQFpUgqU",
>   # Tokyo, Asia
>   "/ip4/47.245.29.58/tcp/8111/p2p/QmYWiwxHasuyou5ztw5uQkHbhm6gs6RB84sbgYxZNGHgaW",
>   # Kualalumpu, Asia
>   "/ip4/47.254.234.14/tcp/8111/p2p/QmfUJGvgXRTM12rSFScXy9GyD3ssuLVSpvscP5nngbhNbU",
>   # California, North America
>   "/ip4/47.89.252.15/tcp/8111/p2p/QmRcUV32qumGrhkTXCWXrMhwGZLKZTmuFzLWacMpSZJ3n9",
>   # Hohhot, Asia
>   "/ip4/39.104.177.87/tcp/8111/p2p/QmQ27jbnww6deXQiv7SmYAUBPA1S3vGcqP9aRsXa4VaXEi",
>   # Singapore, Asia
>   "/ip4/13.228.149.113/tcp/8111/p2p/QmQoTR39rBkpZVgLApDGDoFnJ2YDBS9hYeiib1Z6aoAdEf",

Check List

Tests

• Manual test (add detailed scripts or steps below)
  • Generate the testnet ckb.toml
  • Start ckb using the generated ckb.toml

Release note

Title Only: Include only the PR title in the release note.