Add to dev options features that reached trunkfood recently

This CL enabled:

* `activity_embedding_support_for_connected_displays`
* `enable_connected_displays_dnd`
* `enable_dynamic_radius_computation_bugfix`

Bug: 407954908
Flag: EXEMPT (flag infrastructure)
Test: Build and try dev option
Change-Id: Ic540aadb498423988c92e7b9a86925650d3678f7