txmgr: Fix gas estimation call

[sebastianst]

Description

• The tip cap and fee cap fields have been mixed up
• Also improve logging

Tests

Two fields in the backend call were mixed up. I don't see value now in adding a test that validates that the fields are set properly.

Additional context

This caused a 20 min safe head stall on Goerli earlier today.

[coderabbitai]

Walkthrough

Walkthrough

The recent update to the transaction manager service in the codebase primarily refines variable declarations and enhances logging capabilities. Variables related to gas price calculation are now declared in a grouped syntax for better readability. Additionally, the increaseGasPrice method within the SimpleTxManager has been updated to provide more detailed logging, specifically including gasFeeCap and gasTipCap in its output, which offers more insight into gas price adjustments and estimations.

Changes

File	Summary
op-service/.../txmgr.go	Updated variable declarations to a grouped syntax; enhanced logging in increaseGasPrice method to include gasFeeCap and gasTipCap.

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[ajsutton]

LGTM. Just a couple of log messages to fix up I think.