[riot-notifications] [RIOT-OS/RIOT] tests/unittests: split out atomic_utils unittests (#15438)

[Kaspar Schleiser]

only unrelated failures:

```
    tests/driver_ds3231/samr21-xpro:llvm
    tests/driver_ds3231/esp32-wroom-32:gnu
    tests/driver_ds3231/samr21-xpro:gnu
    tests/pkg_libhydrogen/samr21-xpro:llvm
```

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