Carousel: accessibility audit

[jeherve]

I may be worth doing a full a11y audit for the Carousel feature. Here are the currently known issues.

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1. [A11y] Link in Carousel Code Contains No Text #33616
   [Feature] Carousel [Focus] Accessibility [Plugin] Jetpack [Pri] Low [Type] Enhancement +5
2. A11Y error with keyboard navigation on gallery when using full screen carousel #28291
   [Feature] Carousel [Focus] Accessibility [Plugin] Jetpack [Pri] High [Type] Bug +5
   
3. Carousel: Empty heading tags are created #29141
   Customer Report [Feature] Carousel [Focus] Accessibility [Plugin] Jetpack [Pri] Normal [Type] Enhancement +6
4. [Bug]: Accessibility: Empty <ul> tag .jp-carousel-image-exif #38839
   Triaged [Feature] Carousel [Focus] Accessibility [Platform] Atomic [Platform] Simple [Plugin] Jetpack [Pri] Normal [Status] Priority Review Triggered [Type] Bug +9
5. Carousel: Accessibility - when image set to 'Attachment page', clicking and tabbing should result in same behavior #39926
   [Feature] Carousel [Focus] Accessibility [Pri] Normal [Status] In Progress +4