fix: skip gas refund for coin-type zeta

[kingpinXD]

Description

Skip gas refund for Cointype ZETA
Partially fixes https://github.com/zeta-chain/protocol-private/issues/381 (Refer comments )

How Has This Been Tested?

• Tested CCTX in localnet
• Tested in development environment
• Go unit tests
• Go integration tests
• Tested via GitHub Actions

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Note

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix-skip-gas-refund

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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