avatar: multiple hot-fixes

* TF: Wait for Bluetooth to be powered on.
* Remove Bumble usage of `keystore` and removed `appdirs` dependency.
* Better error handling in avatar's scripts.
* Fixed a typo in Asha tests.
* Updated `pyright` to the latest version.

Test: avatar run
Change-Id: I1834b2c19c909bf31526126fd1183127fd06e54c