ACT rule "Visible label is part of accessible name" (2ee8b8) changes break nightly

Latest ACT update for our rule 2ee8b8 "Visible label is part of accessible name" has [added more examples](https://github.com/w3c/wcag-act-rules/blob/main/content/rules/2ee8b8/proposed.md) which are [breaking our nightly tests run](https://github.com/dequelabs/axe-core/actions/runs/29303327772/job/86991534641). The changes are non-trival as they follow a [new algorithm](https://github.com/w3c/wcag-act-rules/blob/main/content/rules/2ee8b8/proposed.md#label-in-name-algorithm-label-in-name-algorithm) which we don't implement. So things like removing all content between round brackets and maintaining space between spans are currently failing. [Our code currently uses visibleVirtual](https://github.com/dequelabs/axe-core/blob/develop/lib/checks/label/label-content-name-mismatch-evaluate.js#L45-L49) to generate the visible content, which we'll need to figure out if we want to continue to use that function or create a new function just for this algorithm.

This issue is linked to a `skipTests` entry in `test/act-rules/visible-label-in-accessible-name-2ee8b8.spec.js`.