op-service/txmgr: Add threshold to gas price increase limiter

[sebastianst]

Description

Adds a new configuration parameter fee-limit-threshold that sets a lower threshold below which the multiplier limiting set by fee-limit-multiplier is not applied.

The default is set to 100 Gwei, which should be a sane default on mainnet. On testnets, the threshold can probably be set higher.

Tests

Extended the multiplier limit tests to tests both cases, with and without a threshold.

Additional context

This allows for arbitrary fee bumps below a threshold, which is particularly useful on testnets where very-low fee conditions might quickly lead to a situation where the mutliplier limit is unnecessarily applied.

We're recently seeing Goerli safe head halts because of the limit multiplier being applied during either very low fee conditions, or during basefee hikes.

[coderabbitai]

Walkthrough

Walkthrough

The update introduces a new configuration parameter to manage gas fee limits more flexibly in Ethereum transaction management. It refactors gas price adjustment logic and adds a threshold to bypass certain limits for fees below a specified amount. The changes are spread across CLI configurations and the transaction manager's logic, including new tests to verify the functionality.

Changes

File Path	Change Summary
.../txmgr/cli.go	Added FeeLimitThresholdFlagName and related logic; updated structs to include new fee limit fields.
.../txmgr/txmgr.go	Refactored gas price limit checks; added checkLimits method; introduced conditional fee threshold.
.../txmgr/txmgr_test.go	Updated tests; added new tests for gas price limit logic; imported new package; modified test setup.

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