fix: effective gas price

[enitrat]

Pull Request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build-related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Resolves: #

What is the new behavior?

• Fixes an issue where effective gas price was not using the effective tip but the max tip possible
• Used the more logical Transaction function get_effective_gas_price instead of having a separate function
• Now the checks and the computation are done in different places.

Does this introduce a breaking change?

• Yes
• No

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This change is