[WOO POS] Write UI tests for POS screens

[AnirudhBhat]

The goal of this task is to begin writing UI tests for POS screens. We'll start with a few screens initially, evaluate the effectiveness of these tests, and then decide whether to expand testing to all screens based on the value they provide.

Tasks

• [ ] #12377
• [ ] #12430
• [ ] Add UI tests for Exit POS dialog
• [ ] Add UI tests for Products screen

[dangermattic]

Thanks for reporting! 👍