feat(test-runner-junit-reporter): Add support for flat test files to junit-reporter

[JackRobards]

What I did

Add support for test files that do not use a describe block (aka "flat") to the junit-reporter.

A file like this would now be included in the report, where before it would not:

it('under addition', function () {
  chai.expect(1 + 1).to.equal(2);
});

it('null hypothesis', function () {
  chai.expect(true).to.be.true;
});

it('asserts error', function () {
  chai.expect(false).to.be.true;
});

As for what to call the Test Suite - I followed the same pattern that the toResultsWithMetadataByBrowserTestFileName function was using. So each of these test suites will be named based on the browser + file being tested.

This should be a non-breaking change from my testing - it is only intended to detect some test cases that wouldn't be included previously!

closes #2901

[changeset-bot]

🦋 Changeset detected

Latest commit: 6d6ee2b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@web/test-runner-junit-reporter	Minor

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[JackRobards]

@bashmish Is this something you would have time to take a look at, or are there any changes I should make here? I totally get it if you're just busy with other things, but I wanted to check-in in case there's anything I can do here.