DRAFT: feat: first toolkit e2e tests in Rust

[jacek-kurkowski-shielded]

Overview

🗹 TODO before merging

• Ready

📌 Submission Checklist

• Changes are backward-compatible (or flagged if breaking)
• Pull request description explains why the change is needed
• Self-reviewed the diff
• I have included a change file, or skipped for this reason:
• If the changes introduce a new feature, I have bumped the node minor version
• Update documentation (if relevant)
• Updated AGENTS.md if build commands, architecture, or workflows changed
• No new todos introduced

🧪 Testing Evidence

Please describe any additional testing aside from CI:

• Additional tests are provided (if possible)

🔱 Fork Strategy

• Node Runtime Update
• Node Client Update
• Other:
• N/A

Links

[ozgb]

We have some Rust toolkit e2e tests here: https://github.com/midnightntwrk/midnight-node/tree/main/util/toolkit/tests

We don't have contract tests there yet though - may be good to move these tests into util/toolkit/tests too?