UI-EVENT: Reporting group switching in "tab layout" mode

### Description

When "TABS" layout is selected in ui-page, users can switch between groups within the same page (which btw is a great feature).
However, the ui-event node does not capture these interactions, as _technically_ it isn't a page change.

It would be beneficial if the ui-event node could also monitor these interactions, allowing the "backend" to track when users navigate between these "subTabs."

### Have you provided an initial effort estimate for this issue?

I am no FlowFuse team member