🛠 Repo: Tests broken on main for xunit after conflicting merge

[JoshuaKGoldberg]

Tooling Suggestion Checklist

• I have tried restarting my IDE and the issue persists.
• I have pulled the latest master branch of the repository.
• I have read and agree to Mocha's Code of Conduct and Contributing Guidelines
• I have searched for related issues and issues with the faq label, but none matched my issue.
• I want to provide a PR to resolve this

Overview

#4985 was passing in CI, but when merged into main as efbb147, CI started failing. Joyous. Example from https://github.com/mochajs/mocha/actions/runs/8251199633/job/22567745125:

  1 failing

  1) reporters
       xunit
         prints test cases with --reporter-options output (issue: 1864):
     Uncaught UnexpectedError: 
expected '<testsuite name="Mocha Tests" tests="2" failures="0" errors="0" skipped="0" timestamp="Tue, 12 Mar 2024 15:10:50 GMT" time="0.002">\n<testcase classname="suite" name="test1" file="/home/runner/work/mocha/mocha/test/integration/fixtures/passing.fixture.js" time="0"/>\n<testcase classname="suite" name="test2" file="/home/runner/work/mocha/mocha/test/integration/fixtures/passing.fixture.js" time="0"/>\n</testsuite>\n'
to contain '<testcase classname="suite" name="test1" time="'

<testsuite name="Mocha Tests" tests="2" failures="0" errors="0" skipped="0" timestamp="Tue, 12 Mar 2024 15:10:50 GMT" time="0.002">
<testcase classname="suite" name="test1" file="/home/runner/work/mocha/mocha/test/integration/fixtures/passing.fixture.js" time="0"/>
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
<testcase classname="suite" name="test2" file="/home/runner/work/mocha/mocha/test/integration/fixtures/passing.fixture.js" time="0"/>
</testsuite>


      at /home/runner/work/mocha/mocha/test/integration/reporters.spec.js:59:11
      at Array.forEach (<anonymous>)
      at /home/runner/work/mocha/mocha/test/integration/reporters.spec.js:58:24
      at /home/runner/work/mocha/mocha/test/integration/helpers.js:69:7
      at ChildProcess.<anonymous> (test/integration/helpers.js:352:5)
      at ChildProcess.emit (node:events:518:28)
      at maybeClose (node:internal/child_process:1105:16)
      at ChildProcess._handle.onexit (node:internal/child_process:305:5)
      set UNEXPECTED_FULL_TRACE=true to see the full stack trace

Additional Info

@voxpelli will fix this in a moment.