test: #3625657 Add accessibility coverage with webship-js

Rajab Natshahrequested to merge
issue/webapi_starter-3625657:3625657-a11y-coverage into 2.0.x

Runs the axe-core backed webship-js accessibility steps (landmarks, heading order, labels, link and button names, contrast, zoom, keyboard and skip link) over the pages, on webship-js 2.0.6.

Issue: https://www.drupal.org/project/webapi_starter/issues/3625657

AI-Generated: Yes

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