Breadcrumb separators are focusable with the voiceover cursor and get also announced

Problem/Motivation

If you step through the breadcrumb in claro in for example voiceover by pressing "VO-arrow right" the breadcrumb segment separators are focusable and are getting announced, which is not desirable (claro.mp4 - the problem is also illustrated in scott o haras example page https://scottaohara.github.io/a11y_breadcrumbs/ in the screen reader announcements section).

Steps to reproduce

• Test any page in the admin ui with more than one segment in the breadcrumb with a screen reader

Proposed resolution

I would suggest to follow the behavior Olivero is applying (olivero.mp4)

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet