fix: remove the sonic export as it is not supported with aa infra yet

[blakecduncan]

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• Did you add new tests and confirm existing tests pass? (yarn test)
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PR-Codex overview

This PR focuses on removing the sonic and sonicTestnet chain configurations from the chains.ts file, streamlining the chain exports in the index.ts file.

Detailed summary

• Removed sonic and sonicTestnet chain configurations from account-kit/infra/src/chains.ts.
• Updated exports in account-kit/infra/src/index.ts to reflect the removal of sonic and sonicTestnet.

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