Version 4.5.1

Describe the bug

To Reproduce

Steps to reproduce the behavior:

1. Open Mock Bot
2. Turn on Narrator (Edge) or NVDA (Chrome)
3. Type 'layout carousel' into Mock Bot
4. Note that the text activities (non-Markdown) are read multiple times

Expected behavior

Text activities in carousels should only be read once. This is caused by the nesting of in <CarouselLayout>.

Additional context

Uncovered from issue #2273

[Bug]

Note to fixer:
also test Mock Bot command layout