fix(vm): Fix VM divergences related to validation

[slowli]

What ❔

Fixes divergences in VM execution during account validation, or reconsiders what is considered a divergence.

Why ❔

Fixes some of divergences currently observed during oneshot VM execution in the API server in CI (specifically, during the "custom account" integration test).

Checklist

• PR title corresponds to the body of PR (we generate changelog entries from PRs).
• Tests for the changes have been added / updated.
• Documentation comments have been added / updated.
• Code has been formatted via zkstack dev fmt and zkstack dev lint.

[slowli]

• Locally, I've observed little (~2–3%) degradation in some wall-clock VM benchmarks w.r.t. the "default" / fast validation tracer changes; on most benchmarks, there's no observable degradation. Looks expected given that the tracer only tracks Ret(Panic) operations.
• The PR changes fast VM semantics with "default" validation tracing; it now unconditionally fails tx execution if an out-of-gas error is encountered during validation. This is somewhat close to the legacy VM and fixes VM divergences on integration unit tests (e.g. this one). However, it's not a 1-to-1 match because the legacy VM deals with computational gas calculations, meaning that it doesn't flag some out-of-gas errors during validation, like with deep recursion.