test(api): Store VM dumps for diverging executions

[slowli]

What ❔

• Stores VM dumps in the core object store at least for local and CI runs.
• Fails integration tests if VM divergences are observed in API.

Why ❔

Ensures that there are no unexpected VM divergences (previously, there were some because they were only logged).

Is this a breaking change?

• Yes
• No

Operational changes

VM dumps are stored in the object store specified in core_object_store in the general config.

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]

Tested manually by introducing an error to the fast VM wrapper in multivm. Integration tests failed in CI, and VM dumps were added to the generated file artifacts as expected.