Breadcrumb separators are focusable

Problem/Motivation

The breadcrumb separators are focusable with for example the VoiceOver cursor, Claro has this problem as well ( 🐛 Breadcrumb separators are focusable with the voiceover cursor and get also announced Active ), while Olivero is unaffected and behaves correctly (check breadcrumb_separator_announcement.mp4 - in the first round i’ve used tab in the second round ctrl shift arrow right).

Discussed and iterated on the issue with @mgifford, @the_g_bomb, @katannshaw, and @drupa11y

Steps to reproduce

• Go to admin/config/regional/date-time, and with in my case voiceover, actively step through the breadcrumb trail by pressing VO-arrow right

Proposed resolution

• Either Gin is using the underlying functionality in Claro then fix the linked issue and retest after the issue is fixed, if Gin has its own solution in this context, fix it within Gin and orient to the solution Olivero uses.

Remaining tasks

User interface changes

API changes

Data model changes