Fix "Test Snap RPC can use the cross-snap RPC endowment a..." flaky tests

[hjetpoluru]

https://app.circleci.com/pipelines/github/MetaMask/metamask-extension/109232/workflows/567aaab0-c52f-4d43-88c6-24ba3530c19c/jobs/4085503/tests

Test Scenario - Test Snap RPC can use the cross-snap RPC endowment and produce a public key
Test Path - test/e2e/snaps/test-snap-rpc.spec.js
Browser - Chrome
Build - regular

Error: ECONNREFUSED connect ECONNREFUSED 127.0.0.1:38727
    at ClientRequest.<anonymous> (node_modules/selenium-webdriver/http/index.js:296:15)
    at ClientRequest.emit (node:events:519:28)
    at ClientRequest.emit (node:domain:488:12)
    at emitErrorEvent (node:_http_client:108:11)
    at Socket.socketErrorListener (node:_http_client:511:5)
    at Socket.emit (node:events:519:28)
    at Socket.emit (node:domain:488:12)
    at emitErrorNT (node:internal/streams/destroy:169:8)
    at emitErrorCloseNT (node:internal/streams/destroy:128:3)
    at process.processTicksAndRejections (node:internal/process/task_queues:82:21)