Burn fees for legacy transactions

[vbaranov]

Motivation

Incorrect burnt fees and priority fees calculation for legacy transactions. Currently, fees from legacy transactions are not included into total burnt fees.

Changelog

Include legacy transactions into burnt fees
Change priority fees calculation, taking into account, that for legacy transactions:

transaction.max_priority_fee_per_gas = transaction.gas_price
transaction.max_fee_per_gas = transaction.gas_price

Checklist for your Pull Request (PR)

• I added an entry to CHANGELOG.md with this PR
• If I added new functionality, I added tests covering it.
• If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
• I checked whether I should update the docs and did so by submitting a PR to https://github.com/blockscout/docs
• If I added/changed/removed ENV var, I submitted a PR to https://github.com/blockscout/docs to update the list of env vars at https://github.com/blockscout/docs/blob/master/for-developers/information-and-settings/env-variables.md and I updated the version to master in the Version column. Changes will be reflected in this table: https://docs.blockscout.com/for-developers/information-and-settings/env-variables.
• If I add new indices into DB, I checked, that they are not redundant with PGHero or other tools