chore(spec-specs): delay get_code calls in CALL opcodes

[spencer-tb]

🗒️ Description

Delay get_code calls in CALL opcodes until after gas charging and the stack-depth check, so code is only fetched once the call is actually entered.

🔗 Related Issues or PRs

Copies ethereum#2473

✅ Checklist

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

  just 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).

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