feat: if tx is not in mempool stage, we don't need to escalate gas

[kamiyaa]

Description

• EVM, only escalate gas if tx is in Mempool stage

Drive-by changes

Related issues

• fixes https://linear.app/hyperlane-xyz/issue/ENG-2423/lander-escalate-only-if-there-tx-to-replace

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Latest commit: 8938453

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