fix(l1): align mempool error messages with their actual usage #5687
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The human-readable messages for TxGasOverflowError and TxTipAboveFeeCapError were swapped. TxGasOverflowError is only used for arithmetic overflows while computing intrinsic gas in transaction_intrinsic_gas, and TxTipAboveFeeCapError is used when max_priority_fee_per_gas exceeds max_fee_per_gas in validate_transaction. This mismatch produced misleading logs and metrics but did not affect behavior. The change swaps the error annotations so that each variant's message matches its semantic meaning and call sites.