Fix mempool behaviors

[Thaleszh]

Description

Applies two patches to mempool:

• Mempool broadcast fix (fix: experimental EVM mempool not gossiping nonce + n transactions cosmos/evm#890)
• Duplicate broadcast fix (fix(mempool): duplicate tx check and gossipping systemtests cosmos/evm#897)

[coderabbitai]

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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/duplicate-broadcast

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