[Darwin] Finalize bluetooth permissions migration

The Darwin bluetooth permission migration requires some more work.

1 ) Due to reasons laid out in QTBUG-112212, at least following manual tests don't find bluetooth permission plugin and thus will skip or won't work:
-bttestui
-tst_qlowenergycontroller_device
-tst_qlowenergycontroller_peripheral

If the fix for QTBUG-112212 takes awhile, a temporary solution similar to
https://codereview.qt-project.org/c/qt/qtconnectivity/+/468272/4
can be adopted.

2 ) At least following LE examples and applications crash on start:
-bluetoothtestdevice
-heartrate-server

Likely reason being the LE controller's changed internal initialization order due to permissions.

3 ) Heartrate-game needs to be migrated, a patch pending review and testing once the issue with heartrate-server is resolved:
https://codereview.qt-project.org/c/qt/qtconnectivity/+/453087