refactor(testing): Refactor Initcode to allign gas_cost behavior with Bytecode

[marioevz]

🗒️ Description

Refactors on top of #2176 to align behavior of Initcode.gas_cost with what is normally expected of Bytecode.gas_cost.

Method gas_cost now correctly returns the full cost of executing the initcode including the code deposit.

execution_gas and deployment_gas, previously set during instantiation, are now public methods which take the fork as parameter and return the gas cost excluding the code deposit and the code deposit cost, respectively.

The fork parameter requirement was removed from the instantiation of Initcode.

🔗 Related Issues or PRs

N/A.

✅ Checklist

• All: Ran fast tox checks to avoid unnecessary CI fails, see also Code Standards and Enabling Pre-commit Checks:

  uvx tox -e static

• All: PR title adheres to the repo standard - it will be used as the squash commit message and should start type(scope):.
• All: Considered updating the online docs in the ./docs/ directory.
• All: Set appropriate labels for the changes (only maintainers can apply labels).
• Tests: Ran mkdocs serve locally and verified the auto-generated docs for new tests in the Test Case Reference are correctly formatted.
• Tests: For PRs implementing a missed test case, update the post-mortem document to add an entry the list.
• Ported Tests: All converted JSON/YML tests from ethereum/tests or tests/static have been assigned @ported_from marker.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.07%. Comparing base (8e276dc) to head (9800019).
⚠️ Report is 1 commits behind head on forks/amsterdam.

Additional details and impacted files

@@               Coverage Diff                @@
##           forks/amsterdam    #2201   +/-   ##
================================================
  Coverage            86.07%   86.07%           
================================================
  Files                  599      599           
  Lines                39472    39472           
  Branches              3780     3780           
================================================
  Hits                 33977    33977           
  Misses                4862     4862           
  Partials               633      633           

Flag	Coverage Δ
unittests	86.07% <ø> (ø)

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[fselmo]

lgtm! Left some nits but nothing blocking 👍🏼