[Accessibility] Carousel block - Dots navigation doesn't include `aria-current="true"` for current item/slide

[andeng1106]

Describe the bug

• If current slide is present, the dot navigation for the Carousel block doesn't have an aria-current="true"
• See more info here

To Reproduce
Steps to reproduce the behavior:

1. Add a new page
2. Add a Carousel block
3. Save page and view frontend
4. Inspect Carousel's dot navigation (current page)
5. See that there's no aria-current="true" present

Expected behavior

• aria-current="true" should be visible only for the current slider present
• Here's a sample video on how it looks like when navigating.

Screenshots

Screen.Recording.2024-07-18.at.5.1.mp4