test(e2e): stop governance proposal chain monitor

[AztecBot]

Summary

• Investigated merge-train/spartan-v5 dequeue for PR feat: merge-train/spartan-v5 #24053.
• The deterministic failing merge-group run (27606872337, shard x6-full) failed after gov_proposal.parallel.test.ts completed because its ChainMonitor kept polling after Jest teardown.
• Stop the monitor in a finally block so any in-flight poll drains before the test exits.

Notes

• A later merge-group run (27607587707, shard x10-full) failed in forge test --no-match-contract Base while fetching https://binaries.soliditylang.org/linux-amd64/list.json due temporary DNS resolution failure; I did not make a code change for that infrastructure failure.

Verification

• ./bootstrap.sh ci fails immediately because this branch does not define a ci bootstrap target (Unknown command: ci).
• ./bootstrap.sh ci-full-no-test-cache starts but cannot complete in this container: spartan requires sudo to install kubectl, and noir cannot fetch https://index.crates.io/config.json through the proxy/DNS path.
• git diff --check
• .claude/tests/format_file_test (TypeScript prettier subcheck skipped because yarn-project/node_modules/.bin/prettier is not installed)
• .claude/tests/agents_symlink_test

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Created by claudebox · group: slackbot