tests: Bluetooth: ASCS: Modify unittests to native_sim #96736
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Modify the unit tests to use the native_sim board instead of the unit_testing board.
The native_sim board allows us to use the kernel in a more regular way, while still being able to treat the tests as unittest.
To support mocking we cannot rely on the default
Kconfig options and values. The required Kconfig options to satisfy dependencies are overridden in the Kconfig file and the necessary Kconfig files are sourced.
We cannot enable e.g. CONFIG_BT as that would attempt to pull in a lot of files we do not want in this test.
This commit also removes unused includes in the CMakelists, and cleans up the code.
Since the kernel is actually running, we also need to support that e.g. k_work items are actually scheduled, and that we have to wait for them to finish. test_drain_syswq has been implemented as a way to drain the system workqueue before we check for callbacks or perform subsequent actions.