Reasons for creating this PR

One of the vocab-home Cypress tests started failing very often (more than 50%) under GitHub Actions CI. It is a test that verifies that a partial page load is performed after clicking on the hierarchy. Part of the test checks that a mapping to Wikidata is shown properly. This fails, because the expected Wikidata label "fish" is not being shown.

I couldn't replicate the problem locally so I assume this has something to do with traffic between GitHub Actions and Wikidata. Maybe Wikidata blocks some queries?

This PR adjusts the test slightly so that either a label or Wikidata URI is an acceptable value. Now it should work under GitHub Actions as well.

Link to relevant issue(s), if any

n/a

Description of the changes in this PR

• robustness fix: accept either wikidata label or URI in vocab-home cypress test

Known problems or uncertainties in this PR

It was a bit mysterious so not 100% sure this fixes the problem for good.

Checklist

• phpUnit tests pass locally with my changes
• I have added tests that show that the new code works, or tests are not relevant for this PR (e.g. only HTML/CSS changes)
• The PR doesn't reduce accessibility of the front-end code (e.g. tab focus, scaling to different resolutions, use of .sr-only class, color contrast)
• The PR doesn't introduce unintended code changes (e.g. empty lines or useless reindentation)