The network and native currency names for Flare, Songbird and their testnets does not correspond to ethereum-lists, utilized by MetaMask and others as a source of truth. This results in a warning. This PR adjusts the network and native currency names to the official ones defined in ethereum-lists:

• Songbird Canary-Network: https://github.com/ethereum-lists/chains/blob/master/_data/chains/eip155-19.json
• Songbird Testnet Coston: https://github.com/ethereum-lists/chains/blob/master/_data/chains/eip155-16.json
• Flare Testnet Coston2: https://github.com/ethereum-lists/chains/blob/master/_data/chains/eip155-114.json

MetaMask screenshot with warning message

PR-Codex overview

The focus of this PR is to update naming for Flare chains and Songbird networks for clarity and consistency.

Detailed summary

• Updated naming for Flare chains
• Renamed Songbird Mainnet to Songbird Canary-Network
• Adjusted naming for Flare Testnet Coston2
• Renamed Songbird Testnet Coston to Songbird Testnet Coston

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