Author test to validate no driver handles are left open when there is no UWB activity

[abeltrano]

Is your feature request related to a problem? Please describe.
A test should be authored to validate that the service does not keep any handles open when there is no active UWB client or activity. This enables the driver to put the device in a low-power state.

Describe the solution you'd like
Author a test using the UwbSimulator driver. The test should be automatable, so probably a TAEF test makes sense since there are tools available for it that are able to load drivers.

Describe alternatives you've considered
None