Config LE audio connection by default

Use LE audio connection by default, and allow to have the differenct
configuration per project (system property). As using LE audio connection by
default, the toggle, "Show LE audio toggle in Device Details", would be
useless, hide this toggle based on the project configuration

Bug: 300012501
Test: make RunSettingsRoboTests ROBOTEST_FILTER=BluetoothLeDeviceDetailsPreferenceControllerTest
Change-Id: Ia4df48d6a71b5b9f11bd91a69971c8393412da13