test: Attempt to make the test/e2e/tests/request-queuing/ui.spec.js test less flaky

[darkwing]

Description

Isolating the request queueing E2E to just when MULTICHAIN is on.

Related issues

Fixes: N/A

Manual testing steps

1. N/A, it's an E2E

Screenshots/Recordings

Before

After

Pre-merge author checklist

• [ ] I’ve followed MetaMask 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.

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[bot]]

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.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 67.36%. Comparing base (4519cac) to head (8f6ddb6).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #24417   +/-   ##
========================================
  Coverage    67.36%   67.36%           
========================================
  Files         1285     1285           
  Lines        50088    50088           
  Branches     12996    12996           
========================================
  Hits         33738    33738           
  Misses       16350    16350           

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