Fix handling of symlinked device descriptors in keyboard_remote and move...

Fix handling of symlinked device descriptors in keyboard_remote and move remaining sync io to executor thread pool (#30206)

* fix handling of symlinked device decriptors

* make check for symlinked paths more efficient

* make variable names pylint compliant

* move sync io during setup and device connect/disconnect to executor thread pool

* move remaining sync io during setup to executor thread pool

* remove unnecessary lambda functions