feat: add TransactionPayController sentinel messenger test

[dan437]

Description

Follow-up to #33719: add a messenger unit test that asserts getTransactionPayControllerMessenger delegates SentinelApiService:simulateTransactions.

That delegation is the primary breaking integration required by @metamask/transaction-pay-controller v26. An explicit test keeps it from being dropped during future messenger refactors.

Changelog

CHANGELOG entry: null

Related issues

Refs: #33719

Manual testing steps

N/A — unit test only.

Screenshots/Recordings

N/A — no UI changes.

Before

N/A

After

N/A

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Mobile Coding Standards.
• I've completed the PR template to the best of my ability
• I've included tests if applicable
• I've documented my code using JSDoc format if applicable
• I've applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Performance checks (if applicable)

• I've tested on Android
  • Ideally on a mid-range device; emulator is acceptable
• I've tested with a power user scenario
  • Use these power-user SRPs to import wallets with many accounts and tokens
• I've instrumented key operations with Sentry traces for production performance metrics
  • See trace() for usage and addToken for an example

For performance guidelines and tooling, see the Performance Guide.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[github-actions]

🧪 Flaky unit test detection

✅ All previously detected unit test flakiness issues in this PR have been fixed.

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This check is informational only and does not block merging.

[cursor]

Current version of PR was reviewed by /review-bugbot with additional instructions on Jul 24, 10:53 GMT+2. It flagged 0 findings.

^{Bugbot on commit dd48fea is skipped.}

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud