BT LE manual test coverage with device agnostic test

This task originates from QTBUG-100984 which made bluetooth autotests to pass on supported platforms.

Some of the tst_qlowenergy* autotests have manual / live bluetooth testing parts which rely on the presence of a specific TI sensor tag device, with a specific firmware version.
This is suboptimal as such device are not widely available and hence prohibits such testing.

Instead we should remove such test parts and ensure that the essential test functionality is covered by the "bluetoothtestdevice LE peripheral <=> tst_qlowenergycontroller_device LE client" test setup. That setup is device agnostic in that both the peripheral and the client part can be ran on most devices that the Qt bluetooth supports allowing testing more freely.