Add a zero-width space after test name in HTML results

[RikkiGibson]

This PR adjusts the HTML results generation to make it easier to highlight the name of the test with a double-click. I've attached a GIF which shows the existing behavior, and demonstrates a JavaScript snippet which achieves a similar result as this PR.

After the change, it's much easier to double-click, copy the name of the test, and ctrl+F for it in some other place, such as the file where the test is declared.

The JavaScript snippet is not part of the actual change, but included here for reference:

document.querySelectorAll(".leaf-division div:first-child span:nth-of-type(2)").forEach(elem => elem.innerHTML += "​")

[Evangelink]

@RikkiGibson Would you be able to merge/rebase main, we fixed an issue that's affecting your PR.

[RikkiGibson]

Have merged in the latest main. Thanks!

[RikkiGibson]

Thanks very much @Haplois @Evangelink!

[Evangelink]

Thank you for your contribution!