Adjust the testcase.yaml files to only allow running on native_sim.
These tests use mocking and are not meant to run on embedded platforms.
Signed-off-by: Maximilian Deubel <maximilian.deubel@nordicsemi.no>
This patch adds tests for the wifi_credentials library.
Both the main functions and the backend implementations are tested.
Signed-off-by: Maximilian Deubel <maximilian.deubel@nordicsemi.no>