op-service/txmgr: Bump fees by at least 1 wei

[sebastianst]

Description

Fixes an edge-case during near-zero network fee conditions.

Tests

Added test that failed before change.

Additional context

The lack of this causes the txmgr to not properly bump very low fees. E.g. 2 wei + 10% is still 2 wei, rounded, so no bump would happen.

[coderabbitai]

Walkthrough

Walkthrough

The recent update involves a modification to the transaction manager's threshold calculation logic, ensuring a minimum increment of 1 wei in scenarios where network fees are extremely low. Additionally, the test suite for the transaction manager has been expanded with a new test case to verify that the gas price increment logic functions correctly, particularly ensuring the transaction's fee cap and tip are appropriately increased.

Changes

File(s)	Change Summary
op-service/txmgr/txmgr.go op-service/txmgr/txmgr_test.go	Updated calcThresholdValue function to add 1 wei to the threshold if it equals the original x value, addressing near-zero fee conditions. Added a new test case "bump at least 1" to TestIncreaseGasPrice function, enhancing test coverage for gas price increase logic.

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[ajsutton]

Just one suggestion that may be simpler but LGTM.