Inaccessible share flow

[marcus-herrmann]

[This issue is a draft, collecting the accessibility issues of all components related to share/collaborators flow. This issue text will probably be edited several times, and where applicable, specialized, component-related issues will be opened.]

New Collaborators autocomplete

• has no accessible name/label
• auto complete is not perceivable by screen readers

Remove button in "selected collaborators" list is not keyboard accessible

• Is a span with a click event, needs to be a button

Edit and remove buttons in "collaborator overview panel" list is not keyboard accessible

• Is a span with a click event, needs to be a button

Skipping roles select custom select for now

Invisible states of collaborators tab-panel can be reached via keyboard

• Check solution of adding inert and aria-hidden attributes on the container of the invisible state

[marcus-herrmann]

Corresponding PR: #2622